[BUG] Dell G3 3579 – Windows 11 Home: Boot failure (error 0xc0000001) when activating Virtual Machine Platform for Cowork

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?

Bug Report: Cowork causes boot failure (error 0xc0000001) on Dell G3 3579 after Virtual Machine Platform activation
Device Information:

Laptop: Dell G3 3579
OS: Windows 11 Home version 25H2 (Build 26200.8457), Español (España)
Architecture: x64
BIOS: Dell Inc. 1.25.0
Processor: Intel (x64)
Virtualization: Intel VT-x ✅ Enabled, VT for Direct I/O ✅ Enabled (confirmed in BIOS)

Claude Desktop:

Tested with: ClaudeSetup.exe installer and direct MSIX package (claude.ai/api/desktop/win32/x64/msix/latest/redirect)
Both installed as Administrator via PowerShell (Add-AppxPackage)
Plan: Pro

Problem Description:
Every time Cowork attempts to enable Virtual Machine Platform — whether triggered automatically by Claude Desktop or manually via Windows Features — the laptop fails to boot on restart with error code 0xc0000001.
Steps to reproduce:

Install Claude Desktop (tested with .exe and MSIX)
Open Cowork tab and click "Enable" (or manually enable Virtual Machine Platform from Windows Features)
Restart when prompted
System boots to Recovery screen with error 0xc0000001
Windows cannot start properly and requires System Restore to recover

What I tried:

ClaudeSetup.exe installed as Administrator → same error
Direct MSIX package via PowerShell Add-AppxPackage as Administrator → same error
Manual activation via "Turn Windows features on or off" → same error
Verified Intel VT-x and VT for Direct I/O are both enabled in BIOS
Verified Windows 11 Home Build 26200.8457 is fully updated
Performed in-place repair of Windows 11 using matching ISO (26200.8457 es-ES) → same error persists

Recovery method:
Each time this happens, System Restore to a previous restore point is required to recover the system. The laptop has crashed and been restored multiple times attempting to get Cowork working.
Additional notes:

This appears related to issues #25136, #27316, #27420, #29887, and #32004 reported by other users
The error suggests Virtual Machine Platform activation corrupts critical boot files on this specific hardware configuration
Other virtualization software works normally on this machine
Claude Desktop Chat mode works perfectly — only Cowork/VMP activation causes the issue

Expected behavior:
Cowork should activate Virtual Machine Platform without corrupting the boot process.
Actual behavior:
Every VMP activation attempt results in error 0xc0000001 on restart, requiring System Restore to recover.

What Should Happen?

Cowork should successfully enable Virtual Machine Platform and restart the system without corrupting boot files, allowing the Cowork workspace to initialize normally after reboot.

Error Messages/Logs

Error code: 0xc0000001
Screen message: "Your PC couldn't start properly. After multiple tries, the operating system on your PC failed to start, so it needs to be repaired."
Log file location: D:\WINDOWS\System32\Logfiles\Srt\SrtTrail.txt
The error appears immediately after restarting following Virtual Machine Platform activation. The system enters a recovery loop and cannot boot into Windows without performing a System Restore.
Additional log note: The SrtTrail.txt log references drive D:\ instead of C:, which suggests the boot configuration is pointing to the wrong partition after VMP activation corrupts the EFI boot entries.

Steps to Reproduce

1 Install Claude Desktop on Windows 11 Home Build 26200.8457 as Administrator (tested with both .exe installer and direct MSIX package)
2 Sign in with a Pro account
3 Open the Cowork tab in Claude Desktop
4 Click the "Enable" button when the "Virtual Machine Platform not available" message appears
5 Confirm the restart when prompted
6 System restarts and shows the recovery screen with error 0xc0000001
7 Windows cannot boot normally
8 It is necessary to enter the recovery environment and perform a System Restore to recover the machine

Note: The issue also occurs when enabling Virtual Machine Platform manually from "Turn Windows features on or off" without using Claude Desktop, with the same result.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Cualquier versión de Claude Desktop anterior a la introducción de Cowork (febrero 2026).

Claude Code Version

Claude Desktop v1.7196.0 (latest version as of May 2026)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_