How to Fix Windows BSOD DRIVER_IRQL_NOT_LESS_OR_EQUAL Error

Quick Answer: DRIVER_IRQL_NOT_LESS_OR_EQUAL BSOD indicates a driver is accessing memory at an incorrect interrupt request level (IRQL). This typically means a faulty driver, corrupted system file, or hardware issue. Restart in Safe Mode, update drivers, run system file checker, or perform a clean boot to isolate the problem.

What Causes This Error

Step-by-Step Fixes

Fix 1: Restart in Safe Mode and Update Drivers

Restart Windows and press F8 repeatedly during startup (or Shift+Restart from login screen),Select 'Safe Mode with Networking' from boot options,Once in Safe Mode, open Device Manager: 'devmgmt.msc',Look for devices with yellow exclamation marks (problem drivers),Right-click each problematic device and select 'Update driver',Choose 'Search automatically for updated driver software',Restart computer normally after updating all drivers

Fix 2: Run System File Checker (SFC) Scan

Press Windows+R and type 'cmd' to open Command Prompt,Right-click Command Prompt and select 'Run as administrator',Type: 'sfc /scannow' and press Enter,Wait for scan to complete (may take 15-30 minutes),If errors found, SFC will attempt to repair them automatically,Restart computer after scan completes,If BSOD persists, run scan again or try DISM: 'DISM /Online /Cleanup-Image /RestoreHealth'

Fix 3: Perform Clean Boot to Isolate Problem

Press Windows+R and type 'msconfig' to open System Configuration,Click 'Services' tab and check 'Hide all Microsoft services',Click 'Disable All' to disable third-party services,Click 'Startup' tab and click 'Open Task Manager',In Task Manager, disable all startup programs (right-click > Disable),Close Task Manager and click 'Apply' > 'OK' in msconfig,Restart computer in clean boot state,If BSOD doesn't occur, gradually re-enable services/programs to find culprit

Fix 4: Check and Repair Hard Drive

Press Windows+R and type 'cmd' as administrator,Type: 'chkdsk C: /F /R' (replace C: with your drive letter),Press Enter and type 'Y' to schedule scan on next restart,Restart computer; scan will run before Windows boots (may take 1-2 hours),After scan, check results in Event Viewer for any errors,If bad sectors found, consider backing up data and replacing hard drive

Fix 5: Reset BIOS to Default Settings

Restart computer and enter BIOS setup (usually F2, F10, or Del during startup),Look for 'Load Defaults' or 'Reset to Default' option,Select this option and confirm to reset BIOS to factory settings,Save changes and exit BIOS (usually F10),If you overclocked CPU/GPU, disable overclocking in BIOS first,Boot into Windows normally and test for BSOD

FAQs

Q: What does IRQL stand for in DRIVER_IRQL_NOT_LESS_OR_EQUAL?

A: IRQL stands for Interrupt Request Level. It's a priority level for CPU interrupts. The error means a driver tried to access memory at an IRQL level that wasn't allowed, usually indicating a driver bug or memory corruption.

Q: Can bad RAM cause DRIVER_IRQL_NOT_LESS_OR_EQUAL BSOD?

A: Yes, faulty RAM can cause this error. Run Windows Memory Diagnostic (press Windows+R, type 'mdsched.exe') to test RAM. If errors found, replace the RAM module.

Q: How do I know which driver is causing the BSOD?

A: Check the BSOD error message for the driver filename (e.g., 'nvlddmkm.sys' for NVIDIA). You can also check Event Viewer (eventvwr.msc) for detailed error logs.

Q: Is DRIVER_IRQL_NOT_LESS_OR_EQUAL a hardware or software issue?

A: Usually software (driver), but can be hardware (RAM, hard drive). Start with driver updates and system scans. If those don't work, test hardware components.

Q: Should I reinstall Windows if I keep getting this BSOD?

A: Try troubleshooting steps first (driver updates, SFC scan, clean boot). Only reinstall Windows as a last resort if nothing else works. Backup your data before reinstalling.

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