Driver_IRQL_Not_Less_Or_EqualWindows Operating System

How to Fix Driver_IRQL_Not_Less_Or_Equal (Windows Operating System)

Quick Answer

The Driver_IRQL_Not_Less_Or_Equal error indicates a driver attempted to access a memory address it did not have permission to access, often at an elevated IRQL (Interrupt Request Level). This typically points to a faulty device driver, corrupted system files, or hardware issues. The fastest initial fix involves updating or rolling back recently installed drivers.

What Causes This Error

Outdated, corrupted, or incompatible device drivers.
Corrupted system files or Windows operating system files.
Issues with recently installed software or Windows updates.
Faulty or incorrectly configured hardware components, especially RAM.
Malware or virus infections interfering with system processes.
Overheating components causing system instability.

Step-by-Step Fixes

1Update or Roll Back Device Drivers

Press the Windows key + X and select 'Device Manager' from the menu.
Expand categories such as 'Display adapters', 'Network adapters', and 'Sound, video and game controllers'.
Right-click on each device, select 'Update driver', and then choose 'Search automatically for updated driver software'. Follow on-screen prompts.
If the error started after a recent driver update, right-click the device, select 'Properties', go to the 'Driver' tab, and click 'Roll Back Driver' if available. Restart your PC after any changes.

2Run System File Checker (SFC) and DISM Scans

Press the Windows key + R, type 'cmd', then press Ctrl + Shift + Enter to open Command Prompt as an administrator.
In the Command Prompt window, type 'sfc /scannow' and press Enter. Allow the scan to complete, which may take several minutes.
After SFC completes, type 'DISM /Online /Cleanup-Image /RestoreHealth' and press Enter. This command repairs system image issues.
Wait for the DISM process to finish. It may appear to hang at 20% for some time, but it will complete. Restart your computer after both scans are done.

3Check for Windows Updates

Press the Windows key + I to open Settings.
Click on 'Update & Security' (Windows 10) or 'Windows Update' (Windows 11).
Click 'Check for updates' and allow Windows to download and install any available updates.
Restart your computer if prompted after updates are installed. Ensure your system is running the latest stable version of Windows.

4Disable Fast Startup

Press the Windows key + R, type 'powercfg.cpl', and press Enter.
In the Power Options window, click 'Choose what the power buttons do' on the left pane.
Click 'Change settings that are currently unavailable'.
Uncheck the box next to 'Turn on fast startup (recommended)' under Shutdown settings. Click 'Save changes' and restart your computer.

Advanced Fixes

Test RAM for Errors

Press the Windows key + R, type 'mdsched.exe', and press Enter to open the Windows Memory Diagnostic tool.
Select 'Restart now and check for problems (recommended)'.
Your computer will restart and run a memory test. Do not interrupt this process.
After the test, Windows will restart. Check the Event Viewer (Windows Logs > System) for the results of the memory diagnostic. If errors are found, consider replacing the faulty RAM module(s).

Perform a Clean Boot

Press the Windows key + R, type 'msconfig', and press Enter to open System Configuration.
Go to the 'Services' tab, check 'Hide all Microsoft services', and then click 'Disable all'.
Go to the 'Startup' tab, click 'Open Task Manager'. In Task Manager, disable all startup items one by one.
Close Task Manager, click 'OK' in System Configuration, and restart your computer. If the error does not recur, re-enable services and startup items incrementally to identify the culprit.

Frequently Asked Questions

What does 'IRQL_NOT_LESS_OR_EQUAL' mean?

IRQL stands for Interrupt Request Level. This error indicates that a kernel-mode driver attempted to access a memory address at an IRQL that was too high for the requested operation, or that the memory address itself was invalid. This typically signifies a critical issue with a device driver or system memory.

Can hardware cause the Driver_IRQL_Not_Less_Or_Equal error?

Yes, hardware can definitely cause this error. Faulty RAM (Random Access Memory) is a common hardware culprit. Other hardware issues, such as a failing hard drive, an overheating CPU, or an incompatible peripheral, can also contribute to this type of blue screen error.

Is it safe to roll back a driver?

Yes, rolling back a driver is a safe and often effective troubleshooting step if a new driver update caused system instability or the Driver_IRQL_Not_Less_Or_Equal error. It reverts the driver to its previously installed version, which was presumably stable. If the option is not available, it means no previous driver version is stored.

How do I identify the problematic driver?

Sometimes the blue screen error message will display the name of the problematic file, often with a '.sys' extension (e.g., 'nvlddmkm.sys' for NVIDIA drivers). You can also use tools like 'WhoCrashed' or analyze dump files using 'WinDbg' to get more specific information about the driver causing the crash.