xp shutting down and restarting

[gaftop1]

xp2400, abit kd7 board. 512 mb corsair pc 3200, 80 gb maxtor hdd, 400 w ps. xp pro. case is clean, all fans are working.
xp will shutdown at any time. just surfing it will shutdown completely. sometimes restart on it's own, sometimes not. doesn't seem to be heating up but then again?
any help greatly appreciated

 

[jmerokx]

Try a different power supply, maybe it's going out. Another possible cause is faulty RAM or RAM that is mismatched.