

The IRQL_NOT_LESS_OR_EQUAL error can be caused by any of the following, among others: You can read more about what an IRQL (Interrupt Request Level) is at Wikipedia.
#Stop code irql not less or equal fix drivers
Because it involves the interaction between devices connected to your PC (internally or externally), your PC’s mainboard/motherboard, the Windows operating system, and the various devices drivers installed, it can be very difficult to track down and fix.

The IRQL error is an extremely low-level error caused by a resource conflict between two or more devices connected to your PC. Symptom 1: “IRQL NOT LESS OR EQUAL” blue error screen The error messages, alerts, warnings, and symptoms below are tied to this error. The following information on this error has been compiled by NeoSmart Technologies, based on the information gathered and reported by our global network of engineers, developers, and technicians or partner organizations. 3.3 Fix #3: Use EasyRE’s automatic repair and system restore options.3 Fixing “IRQL NOT LESS OR EQUAL” on Windows.2.6 Cause 6: A downgraded Windows installation.
#Stop code irql not less or equal fix software

1.2 Symptom 1: “IRQL NOT LESS OR EQUAL” blue error screen.
