[BUG]

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?

Windows 11 Pro, clean reinstall, Hyper-V enabled, still getting the "virtualization service isn't responding" error after multiple restarts.

What Should Happen?

Cowork should detect that Hyper-V is enabled and start the workspace successfully.

Error Messages/Logs

"Virtualization is not availableClaude's workspace requires Hyper-V, but the virtualization service isn't responding. Restart your computer to resolve this."

Steps to Reproduce

1. Install Claude Desktop on Windows 11 Pro
2. Open Claude Desktop and navigate to the Cowork tab
3. Observe the error: "Virtualization is not available. Claude's workspace requires Hyper-V, but the virtualization service isn't responding."
4. Restart computer — error persists
5. Uninstall Claude Desktop, delete %APPDATA%\Claude and %LOCALAPPDATA%\Claude, reinstall — error still persists

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Unknown / latest version as of March 2026

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

N/A — issue occurs in Claude Desktop GUI, no terminal involved