What is CRITICAL-STRUCTURE-CORRUPTION?
Critical Structure Corruption BSOD (0x109) is a critical-severity system driver issue. A critical system kernel structure corruption occurred. The Windows kernel detected that a third-party driver or hardware modified critical kernel code or data structure. The steps below are ordered to resolve this efficiently.
Common Causes
- Faulty system memory (RAM)
- Malicious software kernel hooks
- Unstable driver modifying kernel tables
Step-by-Step Fix Guide
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1
Run MemTest86 to check memory health
Running memory diagnostics is key because bad RAM is the most common cause of structural metadata corruption.
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2
Uninstall recent drivers or security software
An offline scanner checks for deep rootkits hooking kernel APIs.
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3
Run Windows Defender Offline scan
Still seeing CRITICAL-STRUCTURE-CORRUPTION after that? "Run Windows Defender Offline scan" is the next thing to check.
Commands & Diagnostics
mdsched.exe
Frequently Asked Questions
In most cases, faulty system memory (RAM) is behind CRITICAL-STRUCTURE-CORRUPTION. Malicious software kernel hooks and unstable driver modifying kernel tables can trigger it too.
"Run MemTest86 to check memory health" clears up most CRITICAL-STRUCTURE-CORRUPTION reports by itself. The remaining steps above cover what's left.
Yes — CRITICAL-STRUCTURE-CORRUPTION is a critical-severity error and can lead to data loss or hardware damage if it's ignored. Don't put off the fix steps above.
Usually. CRITICAL-STRUCTURE-CORRUPTION is fixable with the steps above; a full Windows reinstall is rarely necessary unless everything else has failed.
Sometimes. Microsoft regularly releases patches that fix known BSOD triggers including CRITICAL-STRUCTURE-CORRUPTION. Make sure Windows is fully up to date via Settings → Windows Update before attempting more advanced fixes.
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