[BUG] Cowork VM service not running — HYPERVISOR_SERVICE_ERROR / HCS 0x80370102 (Windows 11 Pro, AMD Ryzen, all Hyper-V features 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 fails to start with "VM service not running" error. The cowork_vm_node.log shows HYPERVISOR_SERVICE_ERROR / HCS error 0x80370102: "Cannot create system 'cowork-vm' since Hyper-V is not installed on the host." Cowork should start the VM workspace successfully. Instead it fails immediately at the create_vm_config step every time.

What Should Happen?

Installed Claude Desktop v1.1.7714 on Windows 11 Pro (AMD Ryzen 7 5825U)
Opened Cowork tab, saw "VM service not running" error
Ran Enable-WindowsOptionalFeature for Hyper-V, HypervisorPlatform, and VirtualMachinePlatform — all confirmed Enabled
Confirmed bcdedit hypervisorlaunchtype Auto
Confirmed VirtualizationFirmwareEnabled: True
Confirmed vmms Running, manually started HvHost
Confirmed no WSL, Docker, VMware, VirtualBox, or Device Guard
Deleted vm_bundles directory and restarted — error persists
Full system reboots attempted — error persists
Log shows failure at create_vm_config step with HCS 0x80370102 every attempt

Error Messages/Logs

HCS error block from cowork_vm_node.log showing the 0x80370102 error and the "Cannot create system 'cowork-vm' since Hyper-V is not installed on the host" message.

Steps to Reproduce

Install Claude Desktop v1.1.7714 on Windows 11 Pro (AMD Ryzen 7 5825U)
Ensure all virtualization features are enabled (Hyper-V, HypervisorPlatform, VirtualMachinePlatform)
Confirm virtualization is enabled in BIOS (VirtualizationFirmwareEnabled: True)
Open Claude Desktop
Click the Cowork tab
Observe "VM service not running / The service failed to start" error
Check %LOCALAPPDATA%\Packages\Claude_pzs8sxrjxfjjc\LocalCache\Roaming\Claude\logs\cowork_vm_node.log — shows HCS error 0x80370102 at create_vm_config step

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

Claude Desktop v1.1.7714 (3bd6f6)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_