[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?

Environment

| Item | Value |
|---|---|
| Claude Desktop | v1.1617.0.0 |
| OS | Windows 11 Pro 10.0.26200 x64 |
| Subscription | (your plan) |
| Hyper-V | ✅ Enabled |
| VirtualMachinePlatform | ✅ Enabled |
| HypervisorPlatform | ✅ Enabled |
| hypervisorlaunchtype | Auto |
| CoworkVMService | ✅ Running |
| vmcompute | ✅ Running |

What's Wrong?

Cowork tab permanently shows "La virtualización no está disponible — El espacio de trabajo de Claude requiere Virtual Machine Platform, pero el servicio de virtualización no responde."

Restarting does not resolve it. All virtualization features are fully enabled and confirmed working at every level.

Error from cowork_vm_node.log

VM boot failed: HCS operation failed: failed to create compute system: HcsWaitForOperationResult failed with HRESULT 0x80370102
ErrorMessage: No se pudo iniciar la máquina virtual porque no se instaló una característica requerida.
ErrorEvents: No se puede crear el sistema "cowork-vm-b9118458" porque Hyper-V no está instalado en el host.
HCS error detected, available=true, missing=[], sentinel=HYPERVISOR_SERVICE_ERROR
Startup failed: Error: HYPERVISOR_SERVICE_ERROR
Heartbeat restart failed, leaving VM offline

Steps to Reproduce

1. Install Claude Desktop on Windows 11 Pro 10.0.26200 with all virtualization features enabled
2. Verify: Hyper-V, VirtualMachinePlatform, HypervisorPlatform all Enabled via Get-WindowsOptionalFeature
3. Verify: CoworkVMService Running, vmcompute Running
4. Verify: bcdedit hypervisorlaunchtype = Auto
5. Verify: systeminfo shows "Extensiones de modo de monitor de VM: Sí"
6. Open Claude Desktop and navigate to Cowork tab
7. Error appears immediately on every launch

Troubleshooting Already Attempted

• [x] Restarted computer multiple times
• [x] Clean uninstall (Remove-AppxPackage) + AppData cleanup + reinstall as Administrator
• [x] Manually started CoworkVMService via PowerShell
• [x] Verified vmcompute service is Running
• [x] Verified bcdedit hypervisorlaunchtype is Auto
• [x] Verified systeminfo confirms VM Monitor Extensions active
• [x] Ran DISM /RestoreHealth

Expected Behavior

Cowork should detect that all virtualization features are active and initialize the workspace successfully.

Additional Notes

Regular chat and Code tabs work correctly. Only Cowork is affected. This appears to be the same issue as #32004, #29887, #27420, #27316, #38112.

The vm_bundles/claudevm.bundle file exists and was downloaded successfully. The issue is that HCS fails to create the compute system despite Hyper-V being fully enabled at the OS level.

What Should Happen?

Cowork should detect that all virtualization features are active
and initialize the workspace successfully, allowing normal use
of the Cowork tab. Currently only Cowork is affected — chat and
Code tabs work correctly.

Error Messages/Logs

Steps to Reproduce

1. Install Claude Desktop on Windows 11 Pro 10.0.26200 with all virtualization features enabled
2. Verify: Hyper-V, VirtualMachinePlatform, HypervisorPlatform all Enabled via Get-WindowsOptionalFeature
3. Verify: CoworkVMService Running, vmcompute Running
4. Verify: bcdedit hypervisorlaunchtype = Auto
5. Verify: systeminfo shows "Extensiones de modo de monitor de VM: Sí"
6. Open Claude Desktop and navigate to Cowork tab
7. Error appears immediately on every launch — "La virtualización no está disponible"

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

N/A

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_