Windows BSOD HYPERVISOR_ERROR — What It Means & How to Fix It

Fix Windows Blue Screen of Death HYPERVISOR_ERROR (0x00020001) caused by Hyper-V hypervisor failures or virtualization conflicts. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: HYPERVISOR_ERROR (bug check 0x00020001) indicates the Windows hypervisor encountered a fatal error. This BSOD is related to Hyper-V, Windows Sandbox, WSL2, and other virtualization features. The hypervisor runs at a lower level than the OS kernel and manages virtualization-based security. This error has become more common as Windows 11 enables VBS (Virtualization Based Security) by default. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Conflict between Hyper-V and third-party hypervisors (VMware Workstation, VirtualBox). Outdated or buggy CPU microcode not supporting required virtualization features. Memory corruption affecting the hypervisor's reserved memory regions. Overclocked CPU causing instability in hypervisor operations. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Update BIOS/UEFI firmware to get the latest CPU microcode from your motherboard manufacturer. Disable Hyper-V if not needed: bcdedit /set hypervisorlaunchtype off (restart required). Run Windows Memory Diagnostic: mdsched.exe to check for RAM errors. Revert any CPU overclocking to default speeds and test stability. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Windows Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.