[BUG] Cowork "Virtualization is not available" on Windows 10 — Virtual Machine Platform service not responding after restart

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?

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."

Restarting the computer does not resolve the issue.

What Should Happen?

Expected Behavior
Cowork should detect that virtualization is enabled and successfully start the workspace.
Actual Behavior
Cowork permanently shows the virtualization error. The VM never initializes.
Notes

Regular Chat in Claude Desktop works fine — only Cowork is affected
This appears to be the same known bug as #27316, #29887, #32004, #42227, #45715

Error Messages/Logs

Steps to Reproduce

Steps to Reproduce

Open Claude Desktop on Windows 10
Navigate to the Cowork tab
Error appears immediately
Restarted computer — error persists

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.2581.0 (f10398)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_