[BUG] Missing HCS services: vfpext — persists after DISM/SFC repair and reboot (Windows 11 Pro)

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 табът в Claude Desktop е сив/недостъпен. При посочване с мишката
показва грешка: "Missing HCS services: vfpext"

What Should Happen?

Cowork табът трябва да е активен (не сив) и да позволява стартиране
на нова задача, тъй като Hyper-V, vmcompute и hns са напълно функционални
и активни на системата.

Error Messages/Logs

Get-Service vmcompute
Status   Name        DisplayName
------   ----        -----------
Running  vmcompute   Hyper-V Host Compute Service

Get-Service hns
Status   Name   DisplayName
------   ----   -----------
Running  hns    Host Network Service

sc.exe query vfpext
[SC] EnumQueryServicesStatus:OpenService FAILED 1060:
The specified service does not exist as an installed service.

Test-Path C:\Windows\System32\drivers\vfpext.sys
False

Steps to Reproduce

1. Отвори Claude Desktop на Windows 11 Pro
2. Кликни бутона за нов чат / Cowork таб
3. Задръж курсора на мишката върху сивия Cowork бутон
4. Появява се съобщение: "Missing HCS services: vfpext"
5. Бутонът остава сив и не може да се кликне
6. Провери Get-Service vmcompute → Running
7. Провери Get-Service hns → Running
8. Провери sc.exe query vfpext → service does not exist
9. Провери Test-Path C:\Windows\System32\drivers\vfpext.sys → False
10. Опитай DISM /Online /Cleanup-Image /RestoreHealth и sfc /scannow → и двете завършват успешно, но не оправят vfpext
11. Рестартирай компютъра и провери отново → проблемът остава

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

N/A — not a regression, Cowork has never worked on this machine

Claude Code Version

Version 1.24012.9 (03c61d)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

This issue matches the pattern reported in existing GitHub issues:
#74649, #78858, #78866, #80584 — "Missing HCS services: vfpext"

All standard remediation steps were attempted without success:

• Full uninstall/reinstall of Claude Desktop
• Enabling Hyper-V and Virtual Machine Platform via Windows Features
• Confirmed hardware virtualization enabled in BIOS/Task Manager
• DISM /Online /Cleanup-Image /RestoreHealth (completed successfully)
• sfc /scannow (found and repaired corrupted files)
• Full system reboot after each step

Despite vmcompute and hns services running normally, vfpext remains
completely absent — both as a registered service (sc.exe query fails
with error 1060) and as a driver file on disk (vfpext.sys not found
at C:\Windows\System32\drivers\).

This suggests the driver may be missing from the Windows deployment
source itself (WinSxS component store) for this system configuration,
rather than being a simple servicing corruption that DISM/SFC can repair.

<img width="2402" height="1602" alt="Image" src="https://github.com/user-attachments/assets/a80f5d3e-c2ad-4bc0-9158-5aa9dea9cba1" />