At random, XP will restart on its own. The computer was built less than 2 years ago and I'm not quite sure if it's a software or hardware issue. AMD 2600+, 1.9 ghz, 512mb RAM, windows XP, radeon 9600 graphics card. I find the computer crashes when it's put under a heavy workload. For instance, I opened Spy Bot S&D to rule out any infections and within 30 seconds of running the application the computer restarted. This occured back to back just moments ago. Other times I am using WORD or browsing. This has been occuring for more than 4 months now. I've ran a CPU application to max it out and again the computer restarts. It occurs everytime I run the program. I also monitored my RAM while it performed and only 50% was being utilized. How do I know it's the CPU and not the Motherboard or HD? Thanks!