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0x00000109Severity: High

CRITICAL_STRUCTURE_CORRUPTION

Windows detected that critical kernel code or data was corrupted.

Quick answer

The Windows stop code CRITICAL_STRUCTURE_CORRUPTION (0x00000109) means: Windows detected that critical kernel code or data was corrupted. This code often points to hardware, disk or startup problems. Back up important files as soon as you can and follow the steps below; if it keeps returning, have the PC checked.

Before you start: note the stop code shown on the blue screen. If Windows will not start normally, it usually opens Automatic Repair after two failed starts; from there choose Advanced options to reach Safe Mode or System Restore.

Is it serious? Can I keep using my PC?

Severity: High

This code often points to hardware, disk or startup problems. Back up important files as soon as you can and follow the steps below; if it keeps returning, have the PC checked.

Common causes

  • Faulty, outdated or incompatible driver
  • Faulty or incompatible RAM
  • Conflict with antivirus, VPN or system utility software

How to fix it

  1. Restart the PC. If the blue screen happened only once and does not return, no further action is usually needed
  2. Uninstall recently installed programs, especially antivirus, VPN or system tools
  3. Test the RAM with Windows Memory Diagnostic (mdsched.exe)
  4. Update or roll back the driver of the faulting device in Device Manager (look for yellow warning icons)
  5. Run "sfc /scannow" and "DISM /Online /Cleanup-Image /RestoreHealth" as administrator

Frequently asked questions

What does CRITICAL_STRUCTURE_CORRUPTION mean?

The Windows stop code CRITICAL_STRUCTURE_CORRUPTION (0x00000109) means: Windows detected that critical kernel code or data was corrupted.

Is CRITICAL_STRUCTURE_CORRUPTION serious?

Severity: High. This code often points to hardware, disk or startup problems. Back up important files as soon as you can and follow the steps below; if it keeps returning, have the PC checked.

How do I fix CRITICAL_STRUCTURE_CORRUPTION?

Start with these steps: Restart the PC. If the blue screen happened only once and does not return, no further action is usually needed; Uninstall recently installed programs, especially antivirus, VPN or system tools; Test the RAM with Windows Memory Diagnostic (mdsched.exe); Update or roll back the driver of the faulting device in Device Manager (look for yellow warning icons); Run "sfc /scannow" and "DISM /Online /Cleanup-Image /RestoreHealth" as administrator.

Related codes

0xA IRQL_NOT_LESS_OR_EQUALA driver or system process tried to access memory it was not allowed to use, usually because of a faulty driver.0x1E KMODE_EXCEPTION_NOT_HANDLEDA program running in the Windows kernel caused an error that it did not handle.0x50 PAGE_FAULT_IN_NONPAGED_AREAWindows tried to use memory that does not exist or is not available, often due to a driver, security software or faulty RAM.0x19 BAD_POOL_HEADERThe memory pool used by Windows has become corrupted, usually by a faulty driver.0x3B SYSTEM_SERVICE_EXCEPTIONAn error occurred while a system service was running, often caused by a driver (frequently graphics) or security software.0x3F NO_MORE_SYSTEM_PTESWindows ran out of system page table entries, usually because a driver is not releasing memory.0xBE ATTEMPTED_WRITE_TO_READONLY_MEMORYA driver tried to write to read-only memory.0xC2 BAD_POOL_CALLERA driver or program made an invalid memory request.0xC5 DRIVER_CORRUPTED_EXPOOLA driver corrupted the system memory pool.