[BUG] Cowork fails with HYPERVISOR_SERVICE_ERROR on Windows 11 Pro — all Hyper-V features enabled and verified

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?

Environment:

• OS: Windows 11 Pro (x64)
• Claude Desktop: v1.1.7714.0 (installed via claude.com/download as administrator)
• Subscription: Pro
• Hyper-V: Enabled (Microsoft-Hyper-V-All, Microsoft-Hyper-V-Hypervisor — both Enabled)
• Virtual Machine Platform: Enabled
• bcdedit hypervisorlaunchtype: Auto
• Services: vmcompute (Running), vmms (Running), CoworkVMService (Running, Automatic)
• systeminfo: "VM Monitor Extensions: Yes"
• No VPN, no third-party antivirus

Problem:
Cowork tab stays stuck on "Configuration de l'espace de travail de Claude" with the progress bar near completion. The VM bundle downloads successfully (rootfs.vhdx, vmlinuz, initrd all validated), but VM creation fails every time at the create_vm_config step.

Error from logs (located in %LOCALAPPDATA%\Packages\Claude_pzs8sxrjxfjjc\LocalCache\Roaming\Claude\logs):

HCS operation failed: failed to create compute system: HcsWaitForOperationResult failed with HRESULT 0x80370102
"L'ordinateur virtuel n'a pas pu être démarré car une fonctionnalité requise n'est pas installée."
"Impossible de créer le système cowork-vm car Hyper-V n'est pas installé sur l'hôte."
Sentinel: HYPERVISOR_SERVICE_ERROR

Steps already tried:

1. Enabled Microsoft-Hyper-V-All, VirtualMachinePlatform, and WSL via PowerShell + reboot
2. Verified all services running (vmcompute, vmms, CoworkVMService)
3. Deleted vm_bundles folder and let Claude re-download from scratch
4. Reinstalled Claude Desktop as administrator
5. Stopped/restarted CoworkVMService
6. Confirmed bcdedit hypervisorlaunchtype = Auto

Nothing changes — the error is identical every time. This appears to be the same issue as #25136, #27316, #27420, #29887, and #32004.

Full logs available on request.

What Should Happen?

The configuration phase complete and let work with Cowork, which it doesn't.

Error Messages/Logs

HYPERVISOR_SERVICE_ERROR

Steps to Reproduce

Steps already tried:

1. Enabled Microsoft-Hyper-V-All, VirtualMachinePlatform, and WSL via PowerShell + reboot
2. Verified all services running (vmcompute, vmms, CoworkVMService)
3. Deleted vm_bundles folder and let Claude re-download from scratch
4. Reinstalled Claude Desktop as administrator
5. Stopped/restarted CoworkVMService
6. Confirmed bcdedit hypervisorlaunchtype = Auto

Claude Model

Other

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

None

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_