That's old enough that I'll start with the suggestion to clean your pc. Here's the weekend project video -> http://reviews.cnet.com/4520-11319_7-6240575-1.html
Leave the case cover off after and re-test.
Ok, i know that if i don't put this in i will only get replies "What Are Your computer Specs!!" in a Snotty Nerd Voice. So i will add my Specs:
Intel Pentium 4 3.19GHZ
Creative Sound Blaster Audigy 2
Intel 82801/82801 EB Controllers
ATI Celestia Gold Radeon 9600
And a Couple Network Cards and Modem Cards (All PCI)
If You want anything else just ask...
Well... My Problem:
I will be doing anything and BAM! my Computer just stops... All sound, mouse and keyboard, and all the graphics stop moving but stay there. But the computer is still running. I updated all my drivers and ran Virus and Spyware scans but still the problem looms. (Example: i will be playing Team Fortress 2 and... randomly the sound stops playing and i cant move or look around, but the computer is still running and no Blue Screen of Death)
I NEED HELP FROM THE BRILLIANT PEOPLE OF CNET!!