HYPERVISOR_ERROR is a Windows Blue Screen of Death (BSOD) associated with the Windows hypervisor and virtualization subsystem.

Its bug check value is:

0x00020001

Microsoft defines this bug check as indicating that the hypervisor has encountered a fatal error.

The Windows hypervisor is a low-level virtualization component used not only by traditional Hyper-V virtual machines but also by several Windows security and virtualization technologies. Consequently, you can encounter HYPERVISOR_ERROR even if you do not regularly open Hyper-V Manager.

Technologies that can involve Windows virtualization include:

• Hyper-V
• Windows Hypervisor Platform
• Virtual Machine Platform
• Windows Sandbox
• Windows Subsystem for Linux 2 (WSL2)
• Virtualization-Based Security (VBS)
• Memory Integrity / Hypervisor-Protected Code Integrity
• Credential Guard
• Some Docker configurations
• Some Android emulators and development environments
• Third-party virtualization products interacting with Windows virtualization

A HYPERVISOR_ERROR should therefore be treated as a host-level virtualization, firmware, driver, hardware, or Windows stability problem, rather than automatically assuming that one particular virtual machine is damaged.

HYPERVISOR_ERROR Technical Details

Bug Check Name: HYPERVISOR_ERROR
Bug Check Code: 0x00020001
Category: Windows BSOD / virtualization failure
Affected Component: Windows hypervisor / virtualization stack

Microsoft's bug-check documentation states that all four bug-check parameters are currently reserved. Microsoft recommends using debugger analysis such as !analyze when investigating the underlying cause.

This makes crash-dump analysis particularly important when the problem repeatedly occurs.

Common Symptoms

A system experiencing HYPERVISOR_ERROR may show one or more of the following symptoms:

• Windows suddenly restarts.
• A blue screen displays HYPERVISOR_ERROR.
• Stop code 0x00020001 appears.
• Hyper-V virtual machines unexpectedly stop.
• The PC crashes while starting or stopping a VM.
• Windows crashes after waking from sleep or hibernation.
• The problem begins after a BIOS/UEFI update.
• The problem begins after a Windows Update.
• The problem starts after enabling Hyper-V, WSL2, Sandbox, VBS, or Memory Integrity.
• Virtual machines randomly freeze before the host crashes.
• The PC becomes unstable under heavy CPU or virtualization workloads.
• VMware, VirtualBox, Docker, or an emulator becomes unstable.
• The BSOD occurs during system startup.

What Causes HYPERVISOR_ERROR?

There is no single cause of HYPERVISOR_ERROR. Several components operate underneath or alongside the Windows hypervisor, so troubleshooting should proceed systematically.

1. BIOS/UEFI Virtualization Problems

Hyper-V depends on hardware virtualization features exposed through system firmware.

Microsoft lists important Hyper-V hardware requirements including:

• 64-bit processor
• Second Level Address Translation (SLAT)
• VM Monitor Mode extensions
• Hardware-assisted virtualization
• Hardware-enforced Data Execution Prevention
• Virtualization enabled in BIOS/UEFI

Depending on your CPU and motherboard, virtualization options may appear under names such as:

Intel systems

• Intel Virtualization Technology
• Intel VT-x
• Intel VT-d
• Virtualization Technology

AMD systems

• SVM Mode
• AMD-V
• IOMMU

Incorrect, disabled, or unstable firmware settings can interfere with virtualization.

2. Outdated or Buggy BIOS/UEFI Firmware

The hypervisor communicates closely with CPU and platform firmware.

Firmware bugs involving:

• CPU microcode
• ACPI
• power management
• IOMMU
• virtualization extensions
• memory mapping

can potentially cause low-level virtualization failures.

If HYPERVISOR_ERROR began after changing BIOS settings or updating firmware, firmware should be high on the troubleshooting list.

3. CPU or Memory Instability

Virtualization can place unusual workloads on processors and memory.

Instability may be caused by:

• CPU overclocking
• undervolting
• unstable XMP profiles
• unstable EXPO profiles
• faulty RAM
• excessive temperatures
• motherboard power-delivery problems

A PC that appears stable during ordinary desktop use can still fail under virtualization workloads.

4. Hyper-V Configuration Problems

A damaged or incorrectly configured Hyper-V installation can cause virtualization problems.

Potential issues include:

• damaged Hyper-V components
• boot configuration problems
• incorrect hypervisor launch settings
• incomplete Windows updates
• corrupted virtualization components

Microsoft documents hypervisorlaunchtype as a boot setting controlling whether the hypervisor launches, with supported values including Off and Auto.

5. Windows System File Corruption

Corruption affecting Windows servicing or virtualization components can cause system instability.

Possible causes include:

• interrupted Windows updates
• unexpected shutdown
• disk corruption
• malware damage
• third-party system optimization software
• failed driver installation

Microsoft recommends DISM and System File Checker when repairing Windows component-store and system-file corruption.

6. Problematic Device Drivers

Because the hypervisor operates at a very low system level, defective kernel drivers can contribute to virtualization-related crashes.

Pay particular attention to:

• chipset drivers
• storage/NVMe drivers
• GPU drivers
• network drivers
• motherboard utilities
• RGB/control software
• hardware monitoring tools
• antivirus/security drivers
• VPN drivers
• virtualization software drivers

If HYPERVISOR_ERROR started immediately after installing or updating a driver, investigate that driver first.

7. Conflicts Between Virtualization Platforms

Modern VMware and VirtualBox versions can operate in environments where Windows virtualization is enabled, but configuration and compatibility issues can still occur.

Potentially involved software includes:

• Hyper-V
• VMware Workstation
• Oracle VirtualBox
• Docker Desktop
• WSL2
• Android emulators
• Windows Sandbox

Problems are more likely with older virtualization software or outdated drivers.

8. Virtualization-Based Security

Windows security features can use the hypervisor even when the user has not manually created a Hyper-V VM.

Examples include:

• Virtualization-Based Security
• Memory Integrity
• Credential Guard

Therefore, removing Hyper-V Manager alone does not necessarily mean that Windows has stopped using virtualization.

How to Fix HYPERVISOR_ERROR

Follow the solutions approximately in the order below.

Solution 1: Restart Windows and Check Whether the Error Repeats

If HYPERVISOR_ERROR occurred only once, restart Windows and monitor the system.

A single crash may have been caused by a transient driver or hardware condition.

If it happens repeatedly, continue troubleshooting.

Solution 2: Install Windows Updates

Open:

Settings → Windows Update → Check for updates

Install available:

• cumulative updates
• security updates
• servicing updates
• applicable driver/firmware updates

Restart Windows afterward.

If the BSOD began immediately after a particular update, however, investigate whether uninstalling or rolling back that specific update changes the behavior.

Solution 3: Check Virtualization Status

Open Command Prompt as Administrator and run:

systeminfo

Review the section relating to Hyper-V.

Microsoft recommends systeminfo.exe as a way to check Hyper-V hardware requirements.

On a computer where the Windows hypervisor is already running, you may instead see a message similar to:

A hypervisor has been detected.
Features required for Hyper-V will not be displayed.

This generally indicates that Windows has already loaded a hypervisor.

Solution 4: Verify BIOS/UEFI Virtualization Settings

Restart the computer and enter BIOS/UEFI Setup.

Common keys include:

F2, F10, F12, Delete, or Esc

The exact key varies by manufacturer.

Look for settings such as:

Intel

Intel Virtualization Technology
VT-x
VT-d

AMD

SVM Mode
AMD-V
IOMMU

If you actually use Hyper-V, WSL2, Windows Sandbox, Docker virtualization, or other virtualization technologies, hardware virtualization normally needs to be enabled.

Microsoft's current Hyper-V requirements include hardware-assisted virtualization and hardware-enforced DEP support.

Save changes and restart Windows.

Solution 5: Reset BIOS/UEFI to Default Settings

Incorrect firmware settings can produce difficult-to-diagnose virtualization crashes.

Enter BIOS/UEFI and choose an option such as:

Load Setup Defaults
Load Optimized Defaults
Restore Defaults

Then enable only the settings you actually require.

If the system uses overclocking, XMP, EXPO, PBO, undervolting, or similar performance tuning, test temporarily with stock settings.

Important: Before changing firmware storage settings, record the current SATA/RAID/AHCI configuration. Changing storage-controller modes without preparation can make Windows unbootable.

Solution 6: Update BIOS/UEFI

Visit the support website for your exact computer or motherboard model and check for a newer BIOS/UEFI version.

BIOS updates may contain:

• CPU microcode updates
• memory compatibility improvements
• virtualization fixes
• security fixes
• ACPI improvements
• system stability improvements

Do not install firmware intended for a different motherboard revision or computer model.

For business computers, preferably obtain firmware directly from manufacturers such as Dell, HP, Lenovo, ASUS, Acer, MSI, or the relevant motherboard vendor.

Solution 7: Update Chipset Drivers

Install current chipset/platform drivers appropriate for the system.

For example:

Intel: chipset/platform components from the PC/motherboard manufacturer or Intel where appropriate.

AMD: AMD chipset drivers appropriate for the motherboard platform.

Restart Windows afterward.

Chipset drivers are especially relevant because virtualization interacts closely with CPU, PCIe, power-management, and platform hardware.

Solution 8: Repair Windows with DISM

Open Command Prompt as Administrator.

Run:

DISM /Online /Cleanup-Image /ScanHealth

Then:

DISM /Online /Cleanup-Image /RestoreHealth

Microsoft documents DISM /RestoreHealth as a method for repairing Windows image/component-store corruption.

Allow the operation to finish before closing the window.

Restart Windows if repairs are made.

Solution 9: Run System File Checker

After DISM completes, run:

sfc /scannow

Possible results include:

Windows Resource Protection did not find any integrity violations.

or:

Windows Resource Protection found corrupt files and successfully repaired them.

Microsoft also recommends DISM followed by SFC in Windows servicing/corruption troubleshooting scenarios.

Restart the computer after repairs.

Solution 10: Verify Hypervisor Boot Configuration

Open Command Prompt as Administrator and run:

bcdedit /enum

Look for:

hypervisorlaunchtype

If Hyper-V is supposed to run, you can set it to automatic:

bcdedit /set hypervisorlaunchtype auto

Restart Windows.

Microsoft documents hypervisorlaunchtype Auto as the setting used to allow the hypervisor to launch.

Do not randomly modify other BCDEdit values. Incorrect boot configuration changes can prevent Windows from starting.

Solution 11: Temporarily Disable the Hypervisor for Diagnosis

If you do not need virtualization, temporarily disabling the Windows hypervisor can help determine whether the crashes are directly associated with the virtualization stack.

Run as Administrator:

bcdedit /set hypervisorlaunchtype off

Restart Windows.

Test the computer.

If HYPERVISOR_ERROR completely disappears, virtualization-related configuration, firmware, drivers, VBS, or software compatibility becomes a stronger suspect.

To restore it:

bcdedit /set hypervisorlaunchtype auto

Restart again.

Important: Disabling the hypervisor can prevent features depending on it from working correctly.

Solution 12: Reinstall Hyper-V

If Hyper-V components appear corrupted, reinstalling the feature may help.

Open:

Control Panel → Programs → Turn Windows features on or off

Uncheck:

Hyper-V

Restart Windows.

Then enable Hyper-V again and restart.

Hyper-V is built into supported Windows editions as an optional feature rather than being a separate Hyper-V download.

Microsoft currently lists client Hyper-V support for appropriate Professional and Enterprise editions of Windows 10 and Windows 11.

Solution 13: Check Windows Hypervisor Platform and Virtual Machine Platform

Open:

Turn Windows features on or off

Check whether these features are enabled:

Hyper-V
Virtual Machine Platform
Windows Hypervisor Platform
Windows Sandbox
Windows Subsystem for Linux

Do not simply disable everything on a production computer.

First determine what software depends on each feature.

For example, disabling virtualization components may affect:

• WSL2
• Docker
• Sandbox
• virtual machines
• development environments
• security features

Solution 14: Check Memory Integrity

Open:

Windows Security → Device Security → Core isolation

Check Memory integrity.

If the problem started immediately after enabling Memory Integrity, incompatible low-level drivers deserve investigation.

Temporarily changing security features can be useful as a diagnostic step, but permanently disabling security protections merely to suppress a BSOD is not the preferred solution.

Find and update the incompatible driver whenever possible.

Solution 15: Update Important Device Drivers

Prioritize:

1. Chipset
2. Storage/NVMe
3. Graphics
4. Network
5. Bluetooth/Wi-Fi
6. System management/interface drivers

For laptops and branded desktops, OEM-provided drivers are often a good starting point because they are validated for that system model.

Avoid questionable third-party "driver updater" utilities.

Solution 16: Roll Back a Recently Updated Driver

If HYPERVISOR_ERROR started after a driver update:

Open:

Device Manager

Right-click the relevant device:

Properties → Driver → Roll Back Driver

Then restart Windows.

Common suspects include graphics, chipset, storage, networking, security, and virtualization-related drivers.

Solution 17: Remove CPU Overclocking or Undervolting

Virtualization can expose borderline CPU instability.

Temporarily restore:

CPU Clock = Default
CPU Voltage = Auto/Default
PBO = Default/Disabled for testing
Undervolt = Disabled

Then test again.

If the BSOD disappears, gradually determine which tuning setting caused the instability rather than immediately restoring all previous settings.

Solution 18: Disable XMP/EXPO Temporarily

High-performance memory profiles can occasionally expose RAM or memory-controller instability.

Enter BIOS and temporarily disable:

XMP
EXPO
DOCP

Run RAM at standard/default settings.

If HYPERVISOR_ERROR stops, investigate:

• memory compatibility
• RAM voltage
• memory-controller stability
• BIOS updates
• DIMM placement
• defective memory

Solution 19: Test System Memory

Press:

Win + R

Enter:

mdsched.exe

Choose:

Restart now and check for problems

For persistent problems, a longer dedicated memory test may provide stronger evidence than the basic Windows test.

Also test DIMMs individually if hardware troubleshooting is practical.

Solution 20: Check CPU and System Temperatures

Virtualization workloads can keep multiple CPU cores active for long periods.

Check:

• CPU temperature
• motherboard temperature
• fan operation
• heatsink mounting
• thermal paste condition
• dust accumulation
• case airflow

If crashes primarily happen under high VM workloads, thermal or power instability should be considered.

Solution 21: Check Power Supply Stability

Desktop systems with marginal or failing power supplies can become unstable during CPU-heavy virtualization workloads.

Potential symptoms include:

• sudden restart
• BSOD under load
• random VM crashes
• instability during simultaneous CPU/GPU activity

If hardware tests do not identify another cause, PSU and motherboard power delivery may need professional testing.

Solution 22: Check Event Viewer

Press:

Win + X

Select:

Event Viewer

Navigate to:

Windows Logs → System

Check events immediately before the crash.

Pay attention to entries involving:

• Hyper-V
• Hypervisor
• WHEA
• Kernel-Power
• storage
• disk
• driver failures

The event immediately before a reboot is often more informative than a generic unexpected-shutdown event recorded afterward.

Solution 23: Analyze the Crash Dump

Windows normally stores small crash dumps in:

C:\Windows\Minidump

A larger dump may also exist as:

C:\Windows\MEMORY.DMP

Microsoft specifically recommends debugger analysis for HYPERVISOR_ERROR.

Using WinDbg, open the dump and run:

!analyze -v

Investigate fields such as:

BUGCHECK_CODE
MODULE_NAME
IMAGE_NAME
FAILURE_BUCKET_ID
STACK_TEXT
PROCESS_NAME

Do not assume the first driver name shown in a crash report is automatically the defective component. Kernel crashes often require analysis of the stack, repeated dumps, firmware state, and hardware evidence.

Solution 24: Check for WHEA Hardware Errors

In Event Viewer, investigate:

Windows Logs → System

and search for:

WHEA-Logger

Repeated WHEA errors can point toward hardware or firmware instability involving components such as:

• CPU
• RAM
• PCIe devices
• motherboard
• power delivery

If HYPERVISOR_ERROR occurs alongside WHEA errors, hardware stability should receive high priority.

Solution 25: Check Third-Party Virtualization Software

If installed, update software such as:

• VMware Workstation
• VirtualBox
• Docker Desktop
• Android emulators

Older releases may have compatibility problems with newer Windows virtualization/security configurations.

Do not run obsolete virtualization software on a newly updated Windows installation when a supported version is available.

Solution 26: Test Without Third-Party Security Software

Some endpoint security products install kernel-level drivers.

For diagnosis, check whether the problem began after:

• antivirus installation
• endpoint security update
• VPN installation
• anti-cheat software
• disk encryption software
• system-monitoring software

Do not leave a production machine permanently unprotected. The objective is to identify an incompatible driver and then update, repair, or replace the affected software.

Solution 27: Perform a Clean Boot

A clean boot can help identify conflicts with background software.

Press:

Win + R

Enter:

msconfig

Under Services:

1. Select Hide all Microsoft services.
2. Disable remaining third-party services for testing.

Then review startup applications in Task Manager and restart Windows.

If the BSOD disappears, re-enable items gradually until the problematic component is identified.

Solution 28: Reinstall or Repair Virtualization-Dependent Applications

If the problem only occurs while using one application, repair or reinstall that application.

Examples:

• Docker Desktop
• VMware
• VirtualBox
• Android emulator
• development environment
• VM management utilities

Make sure its current version officially supports your Windows release.

HYPERVISOR_ERROR on Windows Server

On a production Hyper-V server, troubleshooting requires additional caution because disabling Hyper-V can make hosted virtual machines unavailable.

Before major changes:

• Shut down VMs safely.
• Verify VM backups.
• Export critical configuration where appropriate.
• Record virtual switch configuration.
• Record VLAN settings.
• Check storage health.
• Check available host RAM.
• Check CPU utilization.
• Check firmware versions.
• Review recent driver/Windows changes.

Microsoft's Hyper-V troubleshooting guidance includes checking BIOS/UEFI virtualization configuration, Windows/system corruption, drivers, updates, and resource conditions when investigating Hyper-V problems.

Recommended Troubleshooting Order

For most computers, use this sequence:

Step 1: Install applicable Windows updates.

Step 2: Check whether the crash began after a recent driver, BIOS, or Windows update.

Step 3: Verify virtualization settings in BIOS/UEFI.

Step 4: Restore overclocking/undervolting to defaults.

Step 5: Temporarily disable XMP/EXPO if instability is suspected.

Step 6: Update BIOS/UEFI and chipset drivers where appropriate.

Step 7: Run:

DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow

Step 8: Verify:

bcdedit /enum

and, when Hyper-V should run:

bcdedit /set hypervisorlaunchtype auto

Step 9: Update critical device drivers.

Step 10: Test RAM and monitor CPU temperature.

Step 11: Review Event Viewer and WHEA errors.

Step 12: Analyze C:\Windows\Minidump with WinDbg.

This sequence helps avoid unnecessarily reinstalling Windows before firmware, driver, configuration, or hardware causes have been investigated.

Commands Useful for HYPERVISOR_ERROR Troubleshooting

Check system and virtualization information

systeminfo

Check boot configuration

bcdedit /enum

Enable hypervisor launch

bcdedit /set hypervisorlaunchtype auto

Disable hypervisor temporarily

bcdedit /set hypervisorlaunchtype off

Scan Windows image

DISM /Online /Cleanup-Image /ScanHealth

Repair Windows image

DISM /Online /Cleanup-Image /RestoreHealth

Check Windows system files

sfc /scannow

Start Windows Memory Diagnostic

mdsched.exe

Important Precautions

Before changing Hyper-V, BIOS, or virtualization settings:

• Create a backup of important data.
• Create a restore point where appropriate.
• Record existing BIOS settings.
• Do not randomly change VT-d/IOMMU or storage settings.
• Do not modify unknown BCDEdit entries.
• Back up important VMs.
• Shut down production VMs properly.
• Verify BitLocker recovery information before firmware changes on BitLocker-protected systems.
• Avoid unofficial BIOS firmware.
• Do not disable security features permanently merely to hide the problem.

When Is HYPERVISOR_ERROR Likely a Hardware Problem?

Hardware becomes a stronger suspect when:

• HYPERVISOR_ERROR continues after a clean Windows installation.
• Different BSOD codes occur randomly.
• WHEA hardware errors appear.
• RAM tests report errors.
• Crashes happen under CPU load.
• Crashes stop when XMP/EXPO is disabled.
• Crashes stop when CPU overclocking is removed.
• The machine randomly restarts outside Windows.
• BIOS itself freezes or behaves abnormally.
• Multiple operating systems show similar instability.

Possible components include:

• RAM
• CPU
• motherboard
• PSU
• storage device
• PCIe hardware

When Should Windows Be Reinstalled?

Reinstalling Windows should normally be a later troubleshooting step rather than the first solution.

Consider an in-place repair or clean installation when:

• DISM cannot repair Windows.
• SFC repeatedly reports unrepairable corruption.
• virtualization components remain damaged after reinstalling features.
• the problem began after severe system corruption.
• crash analysis does not identify hardware instability.
• extensive third-party driver conflicts cannot be cleanly resolved.

If HYPERVISOR_ERROR returns on a clean Windows installation with updated drivers and default BIOS settings, hardware or firmware should be investigated more aggressively.

FAQ – HYPERVISOR_ERROR

1. What does HYPERVISOR_ERROR mean?

HYPERVISOR_ERROR means that Windows detected a fatal problem involving its hypervisor. Microsoft's bug-check code for this condition is 0x00020001.

2. Is HYPERVISOR_ERROR a hardware problem?

It can be, but not always. Firmware problems, Windows corruption, incompatible drivers, Hyper-V configuration, overclocking, RAM instability, and virtualization software conflicts can also cause or contribute to it.

3. What is the HYPERVISOR_ERROR stop code?

The bug-check value is:

0x00020001

4. Can RAM cause HYPERVISOR_ERROR?

Yes. Faulty or unstable memory can destabilize virtualization workloads. XMP/EXPO configurations can also expose marginal memory stability.

5. Can CPU overclocking cause the error?

Yes. Hypervisor workloads can expose CPU instability that may not appear during ordinary desktop usage.

6. Can undervolting cause HYPERVISOR_ERROR?

Potentially. Excessive undervolting can make a processor unstable under certain workloads. Test at stock voltage/settings when diagnosing repeated crashes.

7. Does HYPERVISOR_ERROR mean my CPU is damaged?

No. The error alone does not prove CPU failure. Driver, firmware, memory, configuration, and Windows problems should also be investigated.

8. How do I check whether virtualization is enabled?

Run:

systeminfo

You can also check the virtualization settings in BIOS/UEFI.

9. How do I enable the Windows hypervisor?

When Hyper-V is correctly installed and intended to run, an administrator can use:

bcdedit /set hypervisorlaunchtype auto

Restart afterward.

10. How do I temporarily disable the Windows hypervisor?

Run as Administrator:

bcdedit /set hypervisorlaunchtype off

Restart Windows.

Remember that applications and security features depending on the hypervisor may stop working.

11. Can WSL2 be related to HYPERVISOR_ERROR?

Potentially. WSL2 uses virtualization technology, so problems in the underlying virtualization environment can affect systems using WSL2.

12. Can Docker cause HYPERVISOR_ERROR?

Docker itself is not necessarily the root cause, but Docker configurations using Windows virtualization can expose existing hypervisor, firmware, driver, or hardware instability.

13. Can VMware or VirtualBox cause this BSOD?

Compatibility problems with outdated virtualization software or drivers can contribute to virtualization instability. Update the virtualization platform before assuming the Windows hypervisor itself is defective.

14. Should I disable Hyper-V permanently?

Not unless you do not require it or have specifically identified it as part of a compatibility issue. Disabling Hyper-V can affect other Windows virtualization and security features.

15. Should I disable Memory Integrity?

Only as a controlled diagnostic test when there is evidence of a driver compatibility issue. The better long-term solution is usually to identify and update or remove the incompatible driver.

16. Can updating BIOS fix HYPERVISOR_ERROR?

It can in some cases, particularly when the underlying problem involves CPU microcode, virtualization, memory compatibility, ACPI, or firmware stability.

17. Can outdated chipset drivers cause virtualization problems?

Yes. Keeping motherboard/chipset and related platform drivers current is an important part of troubleshooting low-level Windows instability.

18. Should I run DISM and SFC?

Yes, especially if Windows corruption is suspected. Common commands are:

DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow

Microsoft documents these tools for repairing Windows image/component-store and system-file corruption.

19. Where are Windows BSOD dump files stored?

Small dump files are commonly located in:

C:\Windows\Minidump

A full/kernel memory dump may be located at:

C:\Windows\MEMORY.DMP

depending on the configured crash-dump settings.

20. How can I identify the exact cause?

Analyze the crash dump with WinDbg and run:

!analyze -v

Microsoft specifically points to debugger analysis for investigating HYPERVISOR_ERROR.

21. Is HYPERVISOR_ERROR the same as "Hypervisor is not running"?

No. HYPERVISOR_ERROR is a BSOD indicating a fatal hypervisor error. A message saying the hypervisor is not running can instead mean that virtualization is disabled or the hypervisor did not launch.

22. What hardware does Hyper-V require?

Microsoft lists requirements including a 64-bit CPU with SLAT, VM Monitor Mode extensions, sufficient RAM, hardware-assisted virtualization, and hardware-enforced DEP.

23. Can Windows Update cause HYPERVISOR_ERROR?

A problem can sometimes appear after an update because Windows, drivers, firmware, or virtualization components have changed. If timing strongly correlates with an update, review update history and crash dumps before removing updates indiscriminately.

24. Can HYPERVISOR_ERROR occur without using Hyper-V Manager?

Yes. Other Windows components can use virtualization technology, so seeing this BSOD does not necessarily mean you manually created or used a Hyper-V virtual machine.

25. What should I do if none of the fixes work?

Use crash-dump analysis, check WHEA events, test RAM, return CPU/RAM settings to stock, update BIOS/chipset drivers, and test the system without unnecessary virtualization/security drivers. If the error persists even after a clean Windows installation with default firmware settings, investigate the hardware.

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