I had a problem with XP crashing after a while and rebooting constantly. When I disabled the automatic reboot, the IRQL_NOT_LESS_OR_EQUAL message appeared. I finally figured out that something was causing a conflict with a driver. This might help you guys who are tearing your hair out.... Start -> Run -> MSConfig Disable everything (certain essential services are unaffected). Then, one at a time, restore items in System.INI, Win.INI, Services, and Startup (There are lots of "services", I do them in blocks of 5). After you re-enable an item, reboot and wait. If the system doesn't crash, go on to the next. If it does crash, the last thing you restored is the culprit. If you find the item, leave that disabled, re-enable everything else and reboot.
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