How to Troubleshoot: DRIVER_IRQL_NOT LESS OR EQUAL (kbdclass.sys) on Windows 10

Blue screen Driver IRQL error NOT LESS OR EQUAL after a recent Windows 10 update or installation of a new hardware device? An IRQL error is a memory-related error that often occurs when a system process or driver attempts to access a memory address for which it does not have the correct permissions. The problem is mostly caused by an incompatible driver, third-party antivirus software, or hardware failure.

In this post, we have listed all possible causes and solutions to fix the Driver_irql_not_less_or_equal bluescreen error in Windows 10. read more