Well I purchased Vista Ultimate and installed it, but didnt like it because it would not let me install BF2 correctly so I reinstalled my XP media center for the time being. When I reinstalled XP I started to get this weird lagging thing going on with my computer. Even when no programs would be running, the computer would lag (Ex - My mouse would move and stutter for half a second and move to where it was going. And the sound would make stutter like if playing a video on windows media player. It usually starts to do this after a little while (couple hours of being on) and once in a while will start acting up within minutes of booting up my rig. Once I restart my computer, this seems to cure the problem until the next time. For those of you who are going to ask, yes i Have up to date VGA drivers, Mobo Drivers, monitor drivers, etc. Setup; E6700 Core 2 Duo - No OC nVidia 8800GTX 2GB OCZ DDR2 800 250 GB Seagate HDD Gigabyte Mobo - forget which model number Thermal take case, 19in Hanns-G Monitor, Zalman all copper CPU cooler Does any one have any advice on what I can do besides reinstalling XP?