irql not less or equal bsod

When you are using your PC, you may find it has a blue screen error, with white words on the screen saying “Your PC ran into a problem and needs to restart. We’re just collecting some error info, and then will restart for you. (0% complete) IRQL_NOT_LESS_OR_EQUAL“. This error is one of the blue screen of death problems, also known as 0x0000000A error.

You may suffer from this error after you install a new hardware or software or after an update. The reasons can be some corrupt system files, faulty hardware, old or incompatible drivers. Here are some solutions to fix the error.



Solution 1: Delete epfwwfp.sys

Solution 2: Find the Faulty Driver by Driver Verifier

Solution 3: Update Drivers

Solution 4: Run Windows Memory Diagnostic

Solution 5: Restore your System


1. Restart your computer.

2. Uninstall the new hardware or software if you had just installed one before the problem appeared.

3. If the blue screen appears before you can log in Windows after you restart your computer, you can enter Safe Mode to try these solutions.

Solution 1: Delete epfwwfp.sys

If you have this blue screen error, you should find epfwwfp.sys in driver files. You can fix your problem by simply deleting this file.

1. Type cmd in the search box beside Start Menu. Right click the result and choose Run as administrator.

2. Type DEL /F /S /Q /A “C:\Windows\System32\drivers\epfwwfp.sys” and click Enter.

Or you can do it by going to This PC > Local Disk (C:) > Windows > System 32 > drivers > epfwwfp.sys > Delete.

Then check if this method helps.

Solution 2: Find the Faulty Driver by Driver Verifier

A faulty driver is very likely to cause this problem. Driver Verifier can help you find the faulty drivers. Then you can go to Device Manager and update this driver. You can follow the below steps to manage it.

1. Type cmd in the search box beside Start Menu. Right-click Command Prompt and choose Run as administrator.

run command prompt

2. Type verifier in Command Prompt and press Enter.

verifier command prompt

3. Then check Create standard settings, and then click Next.

create standard settings

4. Check Automatically select unsigned drivers. Click Next.

automatically select unsigned drivers

Then it will search for unsigned drivers. If there is any, it will tell you. If not, you should try other solutions.

5. Create a new folder on the hard drive.

6. Open My Computer > Disk C > Windows > System 32 > drivers.

7. Drag the unsigned drivers from drivers folder to the new folder you just created.

Resboot your computer and then check if the problem remains.

Solution 3: Update Drivers

This blue screen error occurs maybe because some drivers are outdated. Though you can update drivers in Device Manager, you do not know exactly which driver is outdated. So it will be troublesome to update all drivers by Device Manager.

In this case, you can use Driver Doctor to manage it. Driver Doctor is a professional tool that can help you with downloading and installing updated or missing drivers. Here are steps to use Driver Doctor:

1. Download and install Driver Doctor.

2. Run Driver Doctor and click Scan Now.

scan now

3. Choose Get Drivers.

get drivers

4. Click Download All. After it finished downloading, install them all.

After this process, you successfully updated all drivers. Then your problem should be solved. Supposing the error remains, the reason for your problem may be not driver error. You can try next solutions.

Solution 4: Run Windows Memory Diagnostic

A possible cause of this issue is defective or mismatched RAM (Random Access Memory), and you can fix it by running Windows Memory Diagnostic to test memory problems.

1. Press Windows key and R key. Type mdsched.exe in the box, and click OK.

run mdsched.exe

2. Select Restart now and check for problems (recommended).

restart now and check for problems

3. Then it will restart your computer and scan for memory problems automatically. And the Windows Memory Diagnostic Tool window will appear. This process may take about 15 minutes.

windows memory diagnostic tool

After this process is completed, your computer will restart automatically and the test result will be displayed after you log in.

If you don’t see the result, you can search in Event Viewer by following this path: Event Viewer (right-click Start Menu) > Windows Log > System > Find (in the right pane)> type MemoryDiagnostic > Find Next. Then you can see the result.

find memory diagnostic test result

Solution 5: Restore your System

If the solutions above cannot help you with the problem, you can try to restore your system.

1. Type Control Panel in the search box beside Start Menu. Then click the result.

2. Select View by Small icons. And choose Recovery.

recovery in control panel

3. Choose Open System Restore.

open system restore

Then follow the instructions of the System Restore wizard to restore.

When you encounter this problem of 0x0000000A or irql not less or equal problem, do not be worry. Try the solutions given above to resolve your problem. Hope that they can give some help.


Related Articles:

Fix Memory Management BSOD on Windows 10


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