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. I'm currently running AVG anti-spyware and the pc has not yet shut down. I've also ran HIJACK this and found zero problems within the log. The power supply is running and is not over heating. What other possibilities or tests can I do to rule of the issue? Thanks!