Drivers · critical

How to fixCRITICAL_STRUCTURE_CORRUPTION

Critical Structure Corruption BSOD (0x109)

What this error means

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.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 3 complete
01Run MemTest86 to check memory health

Run MemTest86 to check memory health.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Uninstall recent drivers or security software

Uninstall recent drivers or security software.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Run Windows Defender Offline scan

Run Windows Defender Offline scan.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • Faulty system memory (RAM)
  • Malicious software kernel hooks
  • Unstable driver modifying kernel tables

Useful Windows tools

These commands open Windows tools. Review any action inside the tool before applying changes.

mdsched.exe