Windows OS has a lot of BSOD errors (Blue Screen Of Death), and IRQL_NOT_LESS_OR_EQUAL is one of them. It comes with a few further error codes like “Stop: 0x0000000A or Stop: 0A. Whatever the stop error code is, this error occurs because Windows system files are corrupted, issues with the computer’s hardware or driver corruptions.

In most cases, this error is related to the RAM (Random Access Memory) on your computer. It occurs when a program, application or driver access to the RAM memory without permission. Here are some basic causes that can lead to the “IRQL NOT LESS OR EQUAL” error:

  • Windows system files are corrupted
  • Wrong drivers or drivers conflict
  • Corrupt while installing a program
  • Downgrade from Windows 10 to Windows 7, Windows 8 (or any kind of Windows downgrade)


It happens on all versions of Windows OS, from Windows XP, Windows 7 to Windows 10. If you have this error on your Windows, that’s indicates your computer may need to get repair or restore. However, it’s hard to figure out which one is the cause of this error. So, it’s hard for us to troubleshoot.

A few other BSOD errors you might have on your Windows computer:

Solutions To Fix IRQL_NOT_LESS_OR_EQUAL Error

In this article, we will tell you a few solutions to resolve and remove this error from your Windows computer. These solutions are step by step guides and very easy to follow.

Firstly, remove all USB devices on your computer. It means removing all devices that connected to USB ports on your computer; from printer, scanner, webcam, external hard drive, USB mouse and keyboard. Sometimes, your Windows computer might get the IRQL_NOT_LESS_OR_EQUAL error while scanning and installing a new driver for a new USB device, and then creating this error. So, you have to remove all USB devices from your computer and restart it to test if the problem is gone or not.

  • If the BSOD error is gone, that means you have problems with one of your USB devices. In this case, you have to connect USB devices into your computer one by one to test and determine which one is creating this error. After the cause is determined, download the driver of it from the official website and install it again on your computer, to solve the problem.
  • If the BSOD error still remains, you might have problems with installed drivers, which used by the internal hardware; such as chipset, CPU, graphics card and sound card. Just move to the next step to learn more about this case.

Also Read: Fix The User Profile Service Failed The Logon Error.

Repair, Reinstall And Update Windows Drivers

If you have tried the above solution, but the error still remains. Then one or more of the drivers on your computer (which used by the internal hardware) might be corrupted. In this case, you need to repair, reinstall or update the driver on your Windows computer.

When the IRQL_NOT_LESS_OR_EQUAL error occurs on your computer, it will come with a specific stop error code like D1 or 0A. With the “D1” stop error code, it will show you which driver file is creating the error. But if it comes with the “0A” stop error code, Windows was unable to locate the cause of the problem.

In this case, you can try to use Windows System Log to determine the cause of the problem. To open Windows System Log, click on the Start logo > Run > type “view event logs” > and select Event Viewer from the list.

Event Viewer

You can also access to the Event Viewer by going to Control Panel > Administrative Tools > Event Viewer.

On the left side, select Windows Logs and then click on System. In the list of Windows events, just focus on the event that comes with the red icon. Click on it to learn more about the problem and find an appropriate solution to fix it. For example: if it’s related to chipset driver, you can uninstall the old driver and replace it with the new one.

If you don’t know how to determine the cause of the problem through the detail of the event, then right-click on the event with the red icon, click on Copy and select Copy details as text.

Event Viewer Log

In the next step, paste it into a .txt file (Text file) and save it on your computer.

Next, go to Microsoft Forum and open a new topic to ask for help from Microsoft’s supporters. They will analyze the logs (Text file) and help you determine the problem.

Tip: If you have recently upgraded or installed a new hardware like a new graphics card or a new sound card; then try to remove it and uninstall the driver of it to test if it’s the cause or not.

Also Read: How To Check What Version Of Windows Do I Have?

Restore Or Reset Windows To Solve The IRQL_NOT_LESS_OR_EQUAL Error

If the System Protection is enabled on your computer, you will be able to use this feature to restore your Windows computer back to the working point with Windows System Restore.

In order to restore your Windows, right-click on “My Computer” icon on the desktop, select Properties.

Next, select System Protection from the left side, and then click on “System Restore” button. In the next window, you will be able to select previous points, when your computer still works fine. Just select the point you want to restore back to.

Windows System Restore

The Windows System Restore only works if you have enable this feature before. If the status of the System Protection is off, then there is no previous point to restore back.

If you want to reset your computer, then visit here and learn how to do that.

Tip: Sometimes, just check Windows Update for new updates and apply it. It will help you to fix this error instantly.

Run Hardware Diagnostic To Check Your RAM

If you had a problem with your RAM, it can lead to this error. You can fix it by checking the RAM on your computer and replace it with the good one. Windows has a built-in tool that allows you to do memory diagnostic.

In order to open Windows Memory Diagnostic tool, press Windows key > type “memory diagnostic” and select Windows Memory Diagnostic from the list.

Windows Memory Diagnostic

Start to analyze the RAM on your computer and you should replace the faulty RAM as soon as possible.

Start Memory Diagnostic

We hope this article will help you to fix the IRQL_NOT_LESS_OR_EQUAL error on your Windows computer. If you have any question about this article or need further help on this error, feel free to contact us.