Decided to install an old game Serious Sam II on my main PC and got horrible play since the CD has to be in the drive in order to work. This is a E4400 cpu, 7600GT, 2GB ram rig running XP. Decided to install it on my back up pc which is a Pen 805, Ati 9550 AGP, 1GB ram running Win 2000 and got excellent play. Only real difference I can figure is my new rig has an sata burner and the old one has IDE. Anyone know if this is a known issue and how to fix it???