how much memory do u have?
i have a custom built pc, running windows xp sp2, intel celeron 1.4ghz (overclocked to 1.7ghz), and i can be surfing the web, checking email or whatever and the computer will restart itself. i also got another problem with the computer freezing up, it seems to only happen while im surfing the web and when it does, i cant do anything with it, control, alt, delete doesnt work, i have to press the restart button on the front of the computer case. i usually use internet explorer, but if i use mozilla firefox it doesnt seem to freeze up as much. ive done a complete format of both my hard drives and reinstalled xp and it still does this. please help.