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I have a emachine computer with XP installed on it where sometimes after being on for a little while it will automatically just reboot, only it won't do the windows shutdown process, it just reboots. I replaced the power supply and it still does it. When I tried to update to SP2 about 5 minutes into it, it reboots.. And after searching the web for just a little bit it does it.. any one have any idea what this could be?

i think it is likely that it is overheating. open up the case and see if there is a lot of dust on the CPU heatsink and fan. also, just to make sure, is the cpu fan spinning?

Yea the fan is spinning and there was dust but i vaccumed it

and it is still doing it? hmm.. do you have a seperate graphics card or is it integrated on the motherboard? download speedfan from my signature, and install it. tell me what the temperatures and voltages are.