[BUG] Cowork Windows - "Virtualization is not enabled" despite Hyper-V/VMP/WSL all enabled and CoworkVMService running

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 shows "Virtualization is not enabled - Claude's workspace requires hardware virtualization (Hyper-V)" despite all virtualization features being enabled and the CoworkVMService running. Cowork was working earlier today and broke without any user changes.
Also seeing two MCP connection errors:

"Could not connect to MCP server mcp-registry"
"Could not connect to MCP server Claude in Chrome"

Environment

OS: Windows 11, Lenovo ThinkPad X1 Carbon 7th Gen (20QG)
BIOS: N2HET84W (1.67)
Claude Desktop: MSIX install (Claude_pzs8sxrjxfjjc)

Troubleshooting Already Attempted (all successful, issue persists)

bcdedit /set hypervisorlaunchtype auto → "operation completed successfully"
dism.exe /online /enable-feature /featurename:VirtualMachinePlatform /all → success
dism.exe /online /enable-feature /featurename:Microsoft-Hyper-V-All /all → success
Enabled Windows Subsystem for Linux via optionalfeatures
Multiple restarts
Get-Service CoworkVMService → Status: Running

Key Observation
The CoworkVMService is running and all virtualization prerequisites are confirmed enabled, yet the app reports virtualization is not enabled. This appears to be a false negative in the virtualization detection logic.

What Should Happen?

Expected Behavior
Cowork should detect that virtualization is enabled (as it did earlier today) and start normally.

Error Messages/Logs

No log files found in:

%APPDATA%\Claude\logs\
%LOCALAPPDATA%\Claude\
%LOCALAPPDATA%\Packages\Claude_pzs8sxrjxfjjc\ (no .log files present)

The MSIX install appears to not be generating logs, which is a secondary issue.

Steps to Reproduce

1. Open Claude Desktop (v1.1.3918.0) on Windows 11
2. Click on the "Cowork" tab
3. Error displayed: "Virtualization is not enabled. Claude's workspace requires hardware virtualization (Hyper-V). Enable virtualization in your computer's BIOS/UEFI settings, then restart."
4. Also shows: "Could not connect to MCP server mcp-registry" and "Could not connect to MCP server Claude in Chrome"

Note: Cowork was working earlier the same day with no changes made by the user.

Verified via PowerShell:

• Get-Service CoworkVMService → Status: Running
• bcdedit /set hypervisorlaunchtype auto → completed successfully
• dism.exe /online /enable-feature /featurename:VirtualMachinePlatform /all → success
• dism.exe /online /enable-feature /featurename:Microsoft-Hyper-V-All /all → success
• WSL enabled via Windows Features
• Multiple restarts performed
• No log files found in %APPDATA%\Claude\ or %LOCALAPPDATA%\Packages\Claude_pzs8sxrjxfjjc\

Environment:

• Windows 11, Lenovo ThinkPad X1 Carbon 7th Gen (20QG)
• BIOS: N2HET84W (1.67)
• Claude Desktop: 1.1.3918.0 (MSIX install)

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Yes — it was working this morning.

Claude Code Version

Claude Desktop Version: 1.1.3918.0

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_