I successfully changed to AHCI after installing XP x64 SP1, but now I need to change it back to IDE because of some performance issues (freezing and stuttering) when copying files between two drives (Samsung F1 1TB and WD Raptor 150GB). I assume I have to force install the IDE driver instead, but I can't figure out which one it is. I'm using a Asus P5Q Deluxe board with Intel ICH10R chipset.