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IRQL_NOT_LESS_OR_EQUAL

A driver or Windows tried to use memory it was not allowed to. It is usually a faulty driver, sometimes bad RAM.

How to fix it

1. Think about what changed: a new driver, device or update. Undo it first.
2. Update chipset, graphics, network and storage drivers from the PC maker's site.
3. Test the memory: search for Windows Memory Diagnostic and run it, or use MemTest86 from a USB stick.
4. Turn off any overclock or XMP memory profile in the BIOS to test.

Is it serious?

A driver update fixes most cases. If memory tests show errors, replace the RAM stick.