STOP 0x00000109
CRITICAL_STRUCTURE_CORRUPTION
PatchGuard — Windows' kernel integrity guard — found critical kernel data modified. Either a driver patched the kernel (old security tools, cheats, cracks do this), or memory is corrupting.
Likely causes, most common first
- Software that patches the kernel: old antivirus, game cheats/cracks, some 'system tools'
- Faulty RAM
- A buggy driver
How to fix it
1. Remove kernel-patching software and test RAM easy
- Uninstall cheats, cracks, ancient antivirus versions and dubious 'optimizer' tools.
- Run Windows Memory Diagnostic.
- Update all drivers you can.
The four parameters on the blue screen
Windows shows four hex numbers with this stop code. Here's what each means — our analyzer decodes them automatically from your dump file.
| Parameter 1 | Reserved |
| Parameter 2 | Reserved |
| Parameter 3 | Reserved |
| Parameter 4 | Type of the corrupted region |
Got a crash dump? Get your verdict in seconds
Drop the .dmp file into our analyzer — it runs entirely in your browser. No upload, no size limit, no account.
Analyze my dump file →