Please follow all the steps listed under "Common Game Issues" in my signature. If nothing there helps, make sure you post your system specs. Also, if you could post the exact error from your system (all of it, not just the "IRQL_NOT_LESS_OR_EQUAL" part), that would help.
That error is usually faulty drivers or hardware - in most cases, RAM or video card. We'd need to know the rest of the error to be able to tell though.
A forum community dedicated to tech experts and enthusiasts. Come join the discussion about articles, computer security, Mac, Microsoft, Linux, hardware, networking, gaming, reviews, accessories, and more!