I have been running at 12-15 fps in Left 4 Dead, this is awful, I have replaced every part of this machine and I've had the same issue the whole time. Uninstalled current drivers, went a step down(saw some recommendations on similar situations) I set my settings in game everything to the lowest my control panel settings are set to performance, theres no dust. Speed fan gives me these temps: GPU: 54C TEMP1: 63C TEMP2: 39C TEMP3: 22C HD0: 33C TEMP1: 40C CORE: 54C they seem pretty normal for this processor Any ideas? Intel Penitum D 2.8Ghz dual core 4GB RAM (new) 550w PSU (new) GeForce 8800 gts 512mb Tul TG31 motherboard (new) new CPU heatsink/fan Windows XP

Have you tried to reformatting Windows? Iron Sharpens Iron.

No, a friend at work suggested that today and that could be it actually. I just bought all new hardware except for the processor, without formatting and reinstalling windows so I'll try that and see how it goes. Thanks.