DRIVER IRQL NOT LESS OR EQUAL – Fix it on Windows

Blue Screen of death is a pretty common and unwanted error on Windows. To fix DRIVER IRQL NOT LESS OR EQUAL, you will get some instructions from this article. It is a very blue screen error on Windows 10.

There are many reasons that may cause Driver IRQL Not Less Or Equal BSOD. But, In most cases, It occurs when there is a problem with the network driver. In some cases, Antivirus or third-party firewalls like Bitdefender, Kaspersky, ESET, etc. may create a conflict and you encounter this type of problems. Sometimes, This error includes code like “STOP 0xD1, But, How can you troubleshoot it? Fortunately, It is really easy to solve your problem.

Screenshot: DRIVER IRQL NOT LESS OR EQUAL on Windows 10

How to Fix DRIVER IRQL NOT LESS OR EQUAL on Windows 10

You have several options to get rid of this problem. I recommend you to follow these methods one by one.

Method 1: Update or Roll Back Network Drivers

Corrupted network drivers are mainly responsible for this type of BSOD errors. For some users, rt640x64.sys which is Realtek Network Adapter driver causes the problem. So, As your first attempt to fix driver IRQL not less or equal, you should update it. If you don’t know how to do it, follow this article: How to Update Drivers

However, To update network drivers or any other drivers, I recommend you to use Driver Booster, Driver Easy, Driver Talent, etc. These tools can regularly update your drivers automatically and help your PC to run smoothly. Especially, Driver booster has some cool features that allow you to do much more things. It also can help you to uninstall or roll-back drivers.

However, You also can roll-back drivers manually. To do it, follow these instructions.

  • First of all, Open the start menu, type devmgmt.msc and hit enter.
  • Now, Expand Network Adapters.
  • Then, Right-click on the network drivers and go to their properties one by one.
  • Go to Driver tab and click on Roll Back.
  • Follow on-screen instructions.
  • After that, Restart Windows.

It may fix your problem.

Method 2: Re-Install Network Driver

In case, the first method fails, try to uninstall the network drivers. Then, Install it again to solve your problem. It may work for you. To do it, follow these instructions.

  • At first, Open the Device Manager like method 1.
  • Then, Expand Network Adapters.
  • Then, Right-click on the Network Drivers and choose “Uninstall device.”
  • Follow onscreen instructions.
  • Now, Restart your computer.

Windows will automatically re-install the driver. If you are lucky, it will solve DRIVER_IRQL_NOT_LESS_OR_EQUAL.

Method 3: Delete epfwwfp.sys/bddci.sys (For Bitdefender/ESET Antivirus User)

In some cases, the first two methods may fail. It is because something else is causing blue screen error on your PC. You can find it out but that would be a bit long process. The most common culprits are epfwwfp.sys or bddci.sys. So, You can delete them and see if it solves the problem. To do it, you can simply go to C:\Windows\System32\drivers\ and find these .sys files. If you use ESET, you will see epfwwfp.sys. Bitdefender users will see bddci.sys. Just delete it.

Some users, May not be able to access Windows. Because The DRIVER IRQL NOT LESS OR EQUAL may appear before windows starts properly. In this case, You can boot into recovery mode and delete these files. To do it, follow these instructions.

  • At first, Boot into recovery mode. You can either follow the method one from here or use a bootable Windows media. In this case, Insert bootable pendrive, choose repair your computer when windows setup window appears. Then, Follow the instructions from that link.
  • Make sure, In recovery mode, you have navigated to Troubleshoot > Advanced Options > Command Prompt.
  • Then, Run these commands.
c:
cd Windows
cd system32
cd drivers

ren bddci.sys bddci.sys.bak

or

ren epfwwfp.sys epfwwfp.sys.bak
  • Now, Restart your PC. It should resolve the problem.

Method 4: Disable Antivirus/Firewall or Run Clean Boot

As you are not still sure what is causing that BSOD, you can disable or uninstall the antivirus or firewall program temporarily to see if it helps. You also can boot into clean boot to identify the problematic programs and solve your problem.

Method 5: Analyze Minidump File

The best way to identify the actual reason behind any blue screen of death is by analyzing the minidump file. It will help to find the problematic driver that is causing any BSOD. So, To fix DRIVER IRQL NOT LESS OR EQUAL, it can be a very good option. To analyze minidump, find the corrupted driver, follow the instructions from this article.

These are the most effective methods. Else, you can try to disable PageFile and see if it helps. As the last option, you can re-install Windows. Hopefully, these tips will help to troubleshoot DRIVER_IRQL_NOT_LESS_OR_EQUAL on Windows 10. If you want to add your opinion or know something, you can comment.