[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?

Cowork tab shows: "Virtualization is not available — Claude's workspace requires Virtual Machine Platform, but the virtualization service isn't responding. Restart your computer to resolve this."

Restarting does not resolve it. This issue persists after all troubleshooting steps below.

Environment

• Claude Desktop: latest version from claude.ai/download (installed as Administrator)
• OS: Windows 11 Pro Build 26200.8246

Verified Configuration
| Check | Result |
|---|---|
| Hyper-V | ✅ Enabled |
| Virtual Machine Platform | ✅ Enabled |
| Windows Hypervisor Platform | ✅ Enabled |
| bcdedit hypervisorlaunchtype | ✅ Set to Auto |
| CoworkVMService | ✅ Running |

Steps Taken (none resolved the issue)

1. Enabled Hyper-V, Virtual Machine Platform, and Windows Hypervisor Platform via Windows Features
2. Ran bcdedit /set hypervisorlaunchtype auto as Administrator and restarted
3. Verified CoworkVMService is Running via PowerShell
4. Full clean reinstall: uninstalled Claude, deleted %APPDATA%\Claude and %LOCALAPPDATA%\Claude, rebooted, reinstalled from claude.ai/download as Administrator

What Should Happen?

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

Error Messages/Logs

Cowork permanently shows the virtualization error. The VM never initializes.

Steps to Reproduce

Install Claude Desktop v1.2773.0 on Windows 11 Pro Build 26200.8246 as Administrator
Enable Hyper-V, Virtual Machine Platform, and Windows Hypervisor Platform via Windows Features (optionalfeatures)
Run bcdedit /set hypervisorlaunchtype auto as Administrator and restart
Verify CoworkVMService is Running via Get-Service CoworkVMService
Open Claude Desktop and navigate to the Cowork tab
Observe "Virtualization is not available" error immediately

Result: Error persists. VM never initializes.

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.2773.0 (884b37) 2026-04-15T14:32:09.000Z

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Related Issues
#27316, #27420, #29887, #32004, #37265