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0x00000009BSODCritical

0x00000009 — IRQL not Greater or Equal | Blue Screen Fix Guide

IRQL_NOT_GREATER_OR_EQUAL

Windows XPWindows VistaWindows 7Windows 8Windows 10Windows 11

What Does 0x00000009 Mean?

A kernel operation required the IRQL to be at or above a certain level, but it was below. This indicates a driver is executing at an incorrect IRQL.

Real-World Causes

  1. 1Driver executing at wrong IRQL
  2. 2Synchronization bug in kernel code
  3. 3Corrupted system state

Symptoms

  • ⚠Blue screen with stop code IRQL_NOT_GREATER_OR_EQUAL
  • ⚠System reboots unexpectedly
  • ⚠Possible data loss from unsaved work

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Restart your computer
  2. 2Run System File Checker (sfc /scannow)
  3. 3Check Windows Update
  4. 4Run DISM /Online /Cleanup-Image /RestoreHealth

Advanced Fix

For experienced users and IT professionals

  1. 1Analyze minidump with WinDbg
  2. 2Check Event Viewer for correlated errors
  3. 3Use Process Monitor to trace system activity
  4. 4Perform clean boot to isolate the cause

Frequently Asked Questions

What causes IRQL_NOT_GREATER_OR_EQUAL?
A kernel operation required the IRQL to be at or above a certain level, but it was below. This indicates a driver is executing at an incorrect IRQL.
Can I fix IRQL not Greater or Equal myself?
In many cases yes. Start with basic troubleshooting like restarting, updating drivers, and running System File Checker. If the issue persists, advanced analysis of crash dumps may be needed.

Related Error Codes

0x0000000AIRQL not Less or Equal0x00000008IRQL not Dispatch Level

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.