Blue Screen of Death - Driver IRQL Not Less or Equal - Windows 10/8.1/8/7/Vista/XP
by Jenefey Aaron Updated on 2020-02-28 / Update for Windows Tips
In this post we mainly explain what is IRQL and how to fix Windows IRQL Not Less or Equal BSOD error.
![irql not less or equal blue screen of death error](https://images.tenorshare.com/topics/windows-password/irql-not-less-or-equal.jpg)
What is IRQL?
"An Interrupt Request Level (IRQL) is the priority given to any interrupt request generated by computer hardware. If for instance, a hard disk drive generates an interrupt request signal, and another device, such as a USB printer, generates an interrupt request signal, the two interrupts cannot be serviced simultaneously. The IRQL is used to determine which one is serviced first. In this example, a hard disk interrupt requires a higher priority than a printer interrupt", Wikipedia states.
How to Fix "IRQL_ Not_Less_Or_Equal" Blue Screen of Death Error?
Once "IRQL Not Less Or Equal" error occurs, Windows will become blue screen. You need to use a Windows boot disk to fix it. Here I highly recommend you Windows Boot Genius. It is capable of repairing any BSOD caused by nvlddmkm.sys corrupt, NTLDR missing or others.
Download Windows Boot Genius and install it on a workable PC.
Step 1. Burn a bootable disk
Insert a CD/DVD-ROM or USB Flash Drive into the computer with Windows Boot Genius. After launching, click "Burn" to create a disk to start BSOD computer.
![driver irql not less or equal fix](https://images.tenorshare.com/guide/windows-boot-genius/burn-boot-cd-usb.jpg)
Step 2. Set BIOS
Move the burned disk to connect with the BSOD computer and set BIOS to boot it from the burned CD/DVD/USB Flash Drive.
Step 3. Fix the blue screen
After booting the BSOD computer, click "Windows Rescue" and go to Solution Center to select a situation (Each situation provides symptoms included). Then follow the methods to fix Driver IRQL not less or equal problem.
![how to fix windows irql not less or equal bsod error](https://images.tenorshare.com/guide/windows-boot-genius/crash-before-loading-bar.jpg)
Windows Boot Genius is workable on driver IRQL not less or equal Windows 7 blue screen as well as other Windows OS such as Windows 10, Windows 8.1, Windows 8, Windows Vista and Windows XP. Try it now.