[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?

Claude Cowork destroyed Windows 11 stability — CRITICAL_PROCESS_DIED crashes after installation

Description:
I installed Claude Cowork on my Samsung laptop (NP550XCJ, Windows 11 Home 25H2, Intel i7-10510U, 16GB RAM) on March 26, 2026. Before installation, the system was completely stable for 6 years with no crashes. Immediately after installation, everything broke.
I spent multiple days working with Claude (Sonnet 4.6) trying to fix the damage step by step. We went through every possible solution together — Windows reset, driver updates, registry fixes, ACPI cleanup, kernel analysis via WinDbg — and the system still crashes daily. This report documents everything we tried and what we found.
Immediate problems caused by Cowork:

Windows Search stopped working completely
Microsoft Teams stopped opening
Start Menu became unresponsive
Multiple system files corrupted (confirmed by SFC and DISM)

What we tried to fix it (multiple days of troubleshooting):

Full Windows Reset via Cloud Download
Multiple SFC /scannow and DISM /RestoreHealth cycles — found and repaired corrupt files repeatedly
Disabled Hyper-V completely (bcdedit /set hypervisorlaunchtype off)
Cleaned ACPI registry parameters left by Cowork (APEIOSCGranted, CPPCRevisionGranted, Usb4ControlGranted, BatteryFeaturesGranted, PrmSupportGranted)
Updated Intel UHD Graphics driver from 2020 version to May 2025 version (31.0.101.2140)
Updated NVIDIA GeForce MX110 driver to January 2026 version (32.0.15.8228)
Disabled McAfee services
Repaired EdgeWebView2 Runtime
Ran Windows Memory Diagnostic — no errors found
Ran CHKDSK — no bad sectors found
Analyzed every crash dump with WinDbg using !analyze -v
Reset power plans and cleaned power management settings
Blocked Windows Update from reverting GPU drivers

Crash analysis via WinDbg dump files:
The dumps revealed a progression of corrupted components:

igdkmd64.sys — Intel GPU driver corrupted by Hyper-V GPU virtualization
nvlddmkm.sys — NVIDIA driver also corrupted
ntdll.dll — critical system library corrupted
ntkrnlmp.exe — kernel crashes with nt!PspCatchCriticalBreak + KiPageFault
nt!HvpGetCellPaged — registry hive read failure (KMODE_EXCEPTION_NOT_HANDLED 0x1E)

All crashes are CRITICAL_PROCESS_DIED (0xEF) targeting csrss.exe.
Root cause identified: Cowork activates Hyper-V and creates a Linux VM that corrupted both GPU drivers and ACPI/power management configuration at a level that survives Windows Reset and cannot be fully repaired by SFC/DISM.
System info:

Device: Samsung NP550XCJ-XS2BR
OS: Windows 11 Home Single Language 25H2 (Build 26200.8037)
CPU: Intel Core i7-10510U
RAM: 16GB
GPU: Intel UHD Graphics + NVIDIA GeForce MX110
Cowork installed: March 26, 2026
Crashes began: immediately after Cowork installation
Total crashes since installation: 20+ BSODs

Request: Please provide a complete remediation tool or detailed instructions to fully reverse ALL changes made by Cowork to Windows — including Hyper-V configuration, GPU virtualization settings, ACPI parameters, and any other system-level modifications. The current uninstaller clearly does not revert these changes.

What Should Happen?

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Error Messages/Logs

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Steps to Reproduce

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Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

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Claude Code Version

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Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

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