[BUG] Cowork "Virtualization is not available" — Virtual Machine Platform not responding

Preflight Checklist

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

What's Wrong?

The Cowork tab shows:

"Virtualization is not available — Claude's workspace requires Virtual Machine Platform, but the virtualization service isn't responding. Restart your computer to resolve this."

What Should Happen?

Restarting the computer does not fix the issue. The VM never initializes.

Error Messages/Logs

Steps to Reproduce

1. Install Claude Desktop (latest version) from claude.ai/download
2. Open Claude Desktop and navigate to the Cowork tab
3. Observe the "Virtualization is not available" error immediately
4. Restart the computer — error persists

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Expected Behavior

Cowork should detect that the system supports virtualization and successfully start the VM workspace.

Actual Behavior

Cowork permanently shows the "Virtualization is not available" error. Only the Cowork tab is affected — regular Claude chat works fine.

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Environment

• OS: [Windows 10]
• Claude Desktop version: [ Latest Version]
• Subscription: [Pro]
• CPU: [Intel Core i7-12700 ]
• Virtualization in Task Manager → CPU tab: [Enabled ]

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Checklist

• [ ] Virtual Machine Platform — enabled via optionalfeatures
• [ ] Windows Hypervisor Platform — enabled via optionalfeatures
• [ ] Hyper-V — enabled
• [ ] Virtualization enabled in BIOS/UEFI
• [ ] Restarted after enabling features — error still persists

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.3109.0.0

Platform

Other

Operating System

Windows

Terminal/Shell

Other

Additional Information

<img width="1785" height="787" alt="Image" src="https://github.com/user-attachments/assets/e8f978f4-810e-41ba-9ed7-188e0668d1ab" />