Cowork "Virtualization is not enabled" error after update — Windows 11 Pro, Hyper-V 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 worked on first launch, then broke after an auto-update.
Error: "Virtualization is not enabled"

System: Windows 11 Pro, ASUS TUF Gaming F15 FX506HE
HypervisorPresent: True
Hyper-V: Enabled
vmcompute: Running
hypervisorlaunchtype: Auto

Tried: Clean install, deleted vm_bundles, cleared LocalCache — issue persists.

What Should Happen?

Cowork should start successfully and allow task execution, as it did on first launch.

Error Messages/Logs

Steps to Reproduce

1. Install Claude Desktop on Windows 11 Pro
2. Open Cowork tab — works fine on first launch
3. Allow Claude Desktop to auto-update
4. After update, open Cowork tab
5. Error appears: "Virtualization is not enabled"
6. Tried: clean reinstall, deleted vm_bundles folder, cleared LocalCache — issue persists

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Desktop v1.1.3918 (Windows) — Claude Code CLI not installed

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_