[BUG] Cowork "Virtualization is not available" on Windows 11 Enterprise despite Hyper-V and CoworkVMService fully 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?

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report
• [x] I am using the latest version of Claude Desktop

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Environment

• OS: Windows 11 Enterprise (x64)
• Claude Desktop: Latest version
• Install type: Standard installer

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What's Wrong?

Cowork displays "Virtualization is not available — Claude's workspace requires Hyper-V, but the virtualization service isn't responding" despite all virtualization prerequisites being fully enabled and verified.

Steps to Reproduce

1. Open Claude Desktop on Windows 11 Enterprise
2. Click the Cowork tab
3. Error appears immediately: "Virtualization is not available — Claude's workspace requires Hyper-V, but the virtualization service isn't responding. Restart your computer to resolve this."
4. Restart computer — error persists

System Checks (all passing)

• CoworkVMService: ✅ Running
• vmcompute (Hyper-V Host Compute Service): ✅ Running
• bcdedit hypervisorlaunchtype: ✅ Set to Auto
• Windows 11 Enterprise: ✅ Full Hyper-V support available

Troubleshooting Already Attempted (all unsuccessful)

• Restarted computer multiple times
• Confirmed CoworkVMService and vmcompute services are Running
• Deleted %APPDATA%\Claude\local-agent-mode-sessions folder
• Ran bcdedit /set hypervisorlaunchtype auto as Administrator and rebooted

Expected Behavior

Cowork should detect that Hyper-V is fully enabled and the virtualization services are running, then successfully launch the workspace VM.

Actual Behavior

Cowork consistently shows "Virtualization is not available" regardless of system state. This appears to be a false negative in the virtualization detection logic, similar to issues #27316, #27386, #27420, and #29532.

Additional Notes

Regular Chat mode works perfectly. Only Cowork is affected. This issue appears to be on the Claude Desktop side, not the system configuration.

What Should Happen?

Cowork should detect that Hyper-V is fully enabled and all virtualization services are running (CoworkVMService and vmcompute), then successfully launch the workspace VM without showing the "Virtualization is not available" error.

### Error Messages/Logs

```shell

Steps to Reproduce

1. Open Claude Desktop on Windows 11 Enterprise
2. Click the Cowork tab
3. Error appears immediately: "Virtualization is not available — Claude's workspace requires Hyper-V, but the virtualization service isn't responding. Restart your computer to resolve this."
4. Restart computer — error persists

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

Latest

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_