Ok...with your BIOS...for some reason i thought you had a 6600 not a x1900

hahaha...silly me.
Ok - Set your intergrated video card to disabled or as low as possible...and there's no option to set the PCI-e to primary?
After we've finished with your BIOS - i'm going to give you a few tweaks to try in windows...but they're fairly risky to do (they involve tweaking the registry a bit)...so what i'll do is get you to create a system restore point now, just incase everything goes pair shaped
