claude-code - 💡(How to fix) Fix BUG Cowork shows HYPERVISOR_SERVICE_ERROR on Windows 11 Pro [1 comments, 2 participants]

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anthropics/claude-code#48047Fetched 2026-04-15 06:34:48
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Error Message

Error Messages/Logs

Observe "Virtualization is not available" error

Code Example

Cowork shows HYPERVISOR_SERVICE_ERROR on Windows 11 Pro
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Cowork shows HYPERVISOR_SERVICE_ERROR on Windows 11 Pro. All Hyper-V features are enabled, vmms is running, bcdedit hypervisorlaunchtype is set to auto. Issue persists after multiple restarts.

What Should Happen?

It should let me use claude cowork

Error Messages/Logs

Cowork shows HYPERVISOR_SERVICE_ERROR on Windows 11 Pro

Steps to Reproduce

Install Claude Desktop (latest version) on Windows 11 Pro Open Claude Desktop and navigate to the Cowork tab Observe "Virtualization is not available" error Restarting the computer does not resolve it

Attempted fixes (none resolved the issue):

Restarted computer multiple times Ran Restart-Service vmms -Force and Restart-Service CoworkVMService -Force in PowerShell (Admin) Ran Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V -All Ran DISM /Online /Enable-Feature /FeatureName:Microsoft-Hyper-V /All Ran bcdedit /set hypervisorlaunchtype auto Restarted after each step

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

claude cowork

Platform

Anthropic API

Operating System

windows 11 pro

Terminal/Shell

Terminal.app

Additional Information

No response

extent analysis

TL;DR

The issue might be resolved by investigating and resolving potential conflicts or issues with Hyper-V configuration and dependencies on Windows 11 Pro.

Guidance

  • Verify that all Hyper-V features are correctly enabled and configured, including checking for any potential conflicts with other virtualization software.
  • Check the system's BIOS settings to ensure that virtualization is enabled, as this is a prerequisite for Hyper-V to function correctly.
  • Consider reinstalling Hyper-V or seeking further assistance from Microsoft support, given that the issue persists despite attempting various fixes.
  • Review system logs for any error messages related to Hyper-V or virtualization to identify potential causes.

Example

No specific code snippet can be provided without more detailed information about the system configuration or error logs.

Notes

The provided information suggests that the issue is specific to the interaction between Claude Code and Hyper-V on Windows 11 Pro. Without more detailed error logs or system configuration information, it's challenging to provide a precise fix.

Recommendation

Apply workaround: Given the complexity of the issue and the lack of a clear resolution from the attempted fixes, it may be necessary to seek additional support or consider alternative virtualization solutions if Hyper-V cannot be reliably used with Claude Code on Windows 11 Pro.

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