Hi guys. I have a pretty simple error - when I alt tab out of the game, I get to windows fine, but when I alt tab back in, I get a blue screen of death with IRQL_NOT_LESS_OR_EQUAL. No drivers are referenced, sadly.

I've tried turning off cache options in my BIOS (as the BSOD recommends), unplugging my ADSL modem and network card (the only PCI cards in my computer), unplugging my CDROM drive and spare hard drive, and disabling USB in my BIOS (as it seems that a few USB ports share an IRQ with my network card). No matter what I do I cannot seem to fix it.

The reason I found this problem was that someone found that they could fix flickering by this. I don't think I'm experiencing the same flickering problem I've read about on these forums, though - on mine, the top quarter of the screen loses polygons occasionally. Whenever I get a shot with the spectators (like at the very start) the spectators flash in and out, and when I get a closeup of a player (eg. their shoulders up) the top of their head gets completely cut off.

I've tried changing detonators, to no avail. Has anyone else experienced this problem? Or am I just missing the fix?

AMD 64 3000+ at stock speeds
MSI K8T Neo
MSI FX5900XT with various detonators