HYPERVISOR_ERROR
What is this error?
The Windows hypervisor encountered a fatal error. Commonly triggered by virtualization software conflicts or BIOS virtualization settings.
Common causes
- Hyper-V conflict with game anti-cheat
- virtualization software conflict (VMware, VirtualBox)
- BIOS virtualization settings misconfigured
- Windows Sandbox or WSL conflict
- Memory Integrity (HVCI) conflict
How to fix it
- Disable Hyper-V if not needed
- disable Memory Integrity
- check BIOS virtualization settings
Too many steps? Crashless can diagnose this automatically — checks your drivers, temps, VRAM, and 400+ known error patterns.
Get free AI diagnosis Detailed analysis
Bug check 0x00020001 (HYPERVISOR_ERROR) means Windows' built-in hypervisor (Hyper-V) crashed. Even if you don't use virtual machines, Hyper-V can be enabled by features like Windows Sandbox, WSL2, Memory Integrity, or Docker.
For gamers, this often conflicts with anti-cheat software (Vanguard, BattlEye) or causes performance issues.
How to fix it:
- Disable Hyper-V if you don't need it: open 'Turn Windows features on or off', uncheck 'Hyper-V', 'Virtual Machine Platform', and 'Windows Hypervisor Platform'
- Disable Memory Integrity: Windows Security > Device Security > Core Isolation > Memory Integrity > Off
- Disable Windows Sandbox and WSL if not needed (Turn Windows features on or off)
- In BIOS, check virtualization settings — for Intel: VT-x and VT-d. For AMD: SVM. Try toggling them
- If you need Hyper-V for Docker or WSL2: update Windows fully, update BIOS, and check if the specific game/anti-cheat supports Hyper-V
- Uninstall VMware or VirtualBox if installed — their hypervisors can conflict with Hyper-V
- Restart after making changes — hypervisor changes require a full reboot
When to seek help
If this error keeps happening after trying the fixes above, it may point to a deeper hardware or system issue. Consider professional help if:
- The crash occurs across multiple games or applications
- You see the same error after a clean Windows install
- Your PC is less than a year old (could be a warranty issue)
- You smell burning or hear unusual sounds from your PC
Or let Crashless do the deep analysis for you -- our AI checks drivers, temps, event logs, and 400+ known patterns automatically.
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