A common Windows Blue Screen of Death stop code is labeled IRQL_NOT_LESS_OR_EQUAL. This cryptic name refers to an Interruption ReQuest Line (IRQL) that PCs use to signal events in urgent need of attention or response. You'll see this in either Windows 10 or Windows 11.
In fact, IRQL_NOT_LESS_OR_EQUAL (sometimes referred to as just “IRQL”) is often a memory related error that occurs when a system process or a device driver attempts access to a memory address for which it has no access rights. That’s because per-process memory addresses have an upper bound, so the “NOT_LESS_OR_EQUAL” part refers to an attempt to access a memory address higher than that boundary value.
