In most cases, you will experience IRQL_NOT_LESS_OR_EQUAL blue screen errors after you’ve installed new hardware or software. These IRQL_NOT_GREATER_OR_EQUAL blue screens can also appear during program installation, while a Microsoft Corporation-related software program (eg. Windows Operating System) is running, while a Windows driver is being loaded or during Windows startup or shutdown. Keeping track of when and where your STOP error occurs is a critical piece of information in troubleshooting the problem. https://windows101tricks.com/driver-irql-not-less-or-equal/

Why does IRQL_NOT_LESS_OR_EQUAL occur?

1. The issue pops up on your screen when a memory address triggers an unauthorized access. It could be either a kernel-mode process or a device driver that tries to access this memory address without prior permission.

2. The error also occurs after the installation of a faulty device driver, system service, or BIOS.

3. Incorrectly configured, old, or corrupted device drivers. (very common)

4. Corruption in the Windows registry from a recent software change (install or uninstall).

5. Driver conflict after installing new hardware.

6. Damaged or removed system files after you’ve installed software or drivers related to Windows
Operating System.

7. Error 0x9 blue screen caused by a damaged hard disk.

8. IRQL_NOT_GREATER_OR_EQUAL STOP error also generated due to memory (RAM) corruption.

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