I'd like to add my experience and hope it may be of some help. I was getting this error IRQL_NOT_LESS_OR_EQUAL
However, At least I could reproduce the situation and every time it would bsod with the same error. I went down the hardware path thinking it was video card, ram, psu etc. but after replacing all of the above (it's handy having 4 or more working computers ) I was about to do the old c:\ format and reinstall everything. this is an annoying way to do things but sometimes the only apparent solution, but then I tried one last thing after about 25 or so one last things and remembered i had a cd emulator running which brings up a ghost cd drive in "my computer". once it was disabled no more IRQL_NOT_LESS_OR_EQUAL error and problem solved. Dasha.
