[BUG] Cowork "Virtualization is not available" on Windows despite Virtual Machine Platform and Hypervisor Platform enabled

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 does not resolve it.

Steps to reproduce:

1. Install Claude Desktop on Windows
2. Open Claude Desktop → Cowork tab
3. Error appears immediately. Restarting does not fix it.

What I tried:

• Enabled "Virtual Machine Platform" via Windows Features (optionalfeatures)
• Enabled "Windows Hypervisor Platform" via Windows Features
• Ran bcdedit /set hypervisorlaunchtype auto as Administrator
• Restarted multiple times
• Error persists after all of these steps

Expected behavior:
Cowork should detect that virtualization features are enabled and start the workspace successfully.

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 issue as #27316, #27420, #29887, #32004, #37265.

What Should Happen?

Cowork should detect that all virtualization features are enabled and successfully start the VM workspace, allowing me to use the Cowork tab normally.

Error Messages/Logs

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

Steps to Reproduce

1. Install Claude Desktop on Windows
2. Enable "Virtual Machine Platform" and "Windows Hypervisor Platform" via Windows Features (optionalfeatures)
3. Run bcdedit /set hypervisorlaunchtype auto as Administrator in PowerShell
4. Restart the computer
5. Open Claude Desktop and navigate to the Cowork tab
6. Error "Virtualization is not available" appears immediately and persists after multiple restarts

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.1348.0 (efa3fd) 2026-04-08T15:06:08.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

• Virtual Machine Platform: Enabled
• Windows Hypervisor Platform: Enabled
• Ran bcdedit /set hypervisorlaunchtype auto as Administrator
• Restarted multiple times — error persists
• Regular chat in Claude Desktop works fine, only Cowork is affected
• This appears to be the same known bug reported in #27316, #27420, #29887, #32004, #37265, #42227