Everytime i get done playing the bf2 demo, cs source, doom3, and any other game that i play my computer not always but 90% of the time locks up only after closing the game. As the game is closing all of a sudden my entire screen freezes and i cant even move the coursor and it requires me to do a hard reboot. I have the latest drivers for my video card and ive done a mem test on the memory for 11hrs and it showed now errors. I have also reformated many times with no luck. I have done a hard drive test to see if there is anything wrong with the hard drive, which it then says there is nothing wrong. Any idea would be helpfull. Notice that this problem only occurs after closing the games. This error also just started occuring in the past 2 weeks or so. I built the computer probably around 3 months ago now.
My Comp Specs:
Processor: Pentium 4 3.2ghz
Ram: 512mb DDR2 (A-DATA 512MB 240-Pin DDR2 SDRAM DDR2 533 (PC2 4200) Unbuffered System Memory Model ADJKD1908)
Video Card: BFG GeForce 6600 GT OC 128mb GDDR3 PCI-e
Hard Drive: 160GB Western Digital
Mobo: Intel Desktop Board D915PCY
(I have a 500w power supply that came w/ my case)