How and Why Error IRQL_NOT_LESS_OR_EQUAL Happens
The IRQL_NOT_LESS_OR_EQUAL error occurs when a driver or system component attempts to access memory at an incorrect interrupt request level (IRQL), causing a critical system crash. This typically happens due to faulty hardware, incompatible drivers, corrupted system files, or issues during Windows updates. Common triggers include outdated or conflicting device drivers, especially for graphics cards, network adapters, or storage controllers. Hardware problems like overheating, failing RAM modules, or defective PCI-E slots can also cause this error. The system cannot recover automatically because the error involves low-level memory management, which is essential for core operations. This error often appears during boot or after recent updates, indicating a conflict between software and hardware components.
Possible Fixes
Fix 1: Update or Roll Back Device Drivers
Open the Start menu, type “Device Manager,” and select it from the search results. Expand categories like “Display adapters,” “Network adapters,” or “Storage controllers.” Right-click each device and choose “Update driver” > “Search automatically for updated drivers.” If no updates are found, right-click the device again and select “Properties” > “Driver” tab > “Roll Back Driver” if an older version is available. Restart the computer after completing this process to apply changes.
Fix 2: Run System File Checker and DISM Tools
Press Win + S, type “cmd,” right-click “Command Prompt (Admin),” and select “Run as administrator.” Enter `sfc /scannow` and press Enter. Wait for the scan to complete. If issues are found, restart the computer. Next, run `DISM /online /cleanup-image /restorehealth` in the same Command Prompt window. This repairs corrupted system files. Restart the PC after both processes finish.
Fix 3: Disable Fast Startup and Adjust Power Settings
Open Control Panel > System > Advanced system settings > Performance Options > Change settings. Uncheck “Turn on fast startup” under the “Power” section. Click “OK” and restart the computer. Additionally, go to Start menu > Settings > System > Power & sleep > Choose what the power buttons do. Disable “Fast startup” in both the “Sleep” and “Shutdown” options. Save changes and reboot.
How to Prevent IRQL_NOT_LESS_OR_EQUAL in the Future
Regularly update drivers through Device Manager or manufacturer websites, especially for critical components like graphics cards and network adapters. Avoid installing untrusted hardware or third-party software that may conflict with system processes. Use Windows Update to install OS patches and security fixes. Monitor hardware health by checking temperatures via tools like HWMonitor or Core Temp to prevent overheating. If using external devices, ensure they are compatible with your system’s architecture and firmware. Perform periodic disk checks using `chkdsk` to identify and resolve file system errors that could contribute to instability.