Fix: IRQL_NOT_LESS_OR_EQUAL Error in Windows 11/10

The error message IRQL_NOT_LESS_OR_EQUAL appears simultaneously with a blue screen on your Windows 11 or Windows 10 PC. It usually occurs due to an incompatible driver, third-party software, and hardware failure. You may also see a DRIVER prefix, the DRIVER_IRQL_NOT_LESS_OR_EQUAL error message. It suggests that a driver in kernel mode tried to access a memory address to which it did not have permission.


IRQL means Interrupt Request Level, and NOT_LESS_OR_EQUAL indicates the boundary level outside the value. Sometimes an incorrect or corrupted driver goes to the wrong place in memory, and we encounter an IRQL_NOT_LESS_OR_EQUAL error. This error message is displayed when the memory location is not resolved on the PC.


How to Fix IRQL_NOT_LESS_OR_EQUAL Error in Windows 11/10

We will discuss all the possible solutions for the BSOD with the irql_not_less_or_equal error. It might be difficult for beginners, but experienced ones can quickly fix the issue by following the below methods.

Method 1: Enter Safe Mode

You need to enter Safe Mode for any change when updating the driver, uninstalling the software etc. Safe Mode loads the operating system without third-party services.

  • Press the restart button on your PC many times to provoke an error and bring up a process diagnostic menu.
  • Now turn on the PC, and then wait until it boots up to the maximum before the error.
  • You need to press and hold the power button on your PC to turn it off completely.
  • Repeat the procedure 3-4 times, and you will see a recovery menu.
  • Once you access the recovery environment, go to “Troubleshooting”> “Advanced options”> “Boot options”> “Restart”, and then press on the keyboard “F4” or number 4.

Method 2: Run Memory Diagnostic Tool

IRQL_NOT_LESS_OR_EQUAL error also occurs when the kernel-mode driver makes an invalid trial to access a memory address. So it could be related to memory issues that generate BSODs on PC. Hence it would help if you run a memory diagnostic tool.

  • Tap on the “Start” button.
  • Look for ” Windows Memory Diagnostic ” and click on it.

Memory Diagnostic Tool

  • A window will open where you must select the first option, “Restart Now and check for Problem”, and restart your PC.
  • During restart, it will carefully check the RAM and show you errors.
  • If you see an error, this suggests that the issue is in your memory and you need to replace it.

Method 3: Update PC and Driver

Sometimes the error (driver_irql_not_less_or_equal) is also caused by Drivers. Some faulty driver file in Windows 11/10 is specified as iaStorA.sys, iaisp64 sys, Netwtw04.sys, nvlddmkm.sys, ndis.sys, wrUrlFlt.sys. So you need to update your PC and Drivers. To do this:

  • Go to Settings> Update & Security.
  • Head over to the path: Windows Update> Check for Updates to get the latest update.
  • Once the download is complete restart your PC.
  • Now open Device Manager (Press Win+X and click on Device Manager from the list).
  • Click on the View tab and you will see a list of devices in Device Manager.
  • Find the device that caused the problem and select “Update Driver”.
  • Finally, click on “Search automatically for updated driver” and wait for a while for the update to succeed.

Method 4: Return the PC to its original state

If you have tried almost all the possible solutions to fix IRQL_NOT_LESS_OR_EQUAL and cannot fix it. So now you need to restore your system to default settings.

  • Open “Settings” (Use the Win+I shortcut key).
  • Click on the “Update and Security” option and then tap on Recovery
  • Now in the next window, you have to click on Reset PC.
  • You will see two options: Keep my files and Remove everything. So select as per your preference.
  • Follow the on-screen steps to reset your PC.

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