Re: Computer running XP keeps restarting
Personally I'd backup everything you regard as critical just to be safe.
What are the system specs?
All very well people troubleshooting for you but I fail to see how they can make any but the most generalised suggestions without knowing what the hardware is.
Most "instant" restarts are psu related, memory restarts should give a blue screen, overheating (Intel) cpu's will throttle.
There are sooooo many variables that without hardware detail specifics it's all guesswork/conjecture.
E8600@ 4.25GHz, 1.325V | Thermalright Ultra 120 eXtreme + Scythe Slipstream 120 | Asus Rampage Extreme| 4GB Corsair 2000MHz 8-8-8-24 @ 1600 6-7-6-24| ASUS 9800GTX| Pioneer 18X SATA DVD-RW | 320GB + 500GB WD SATAII | Antec True Power Trio 650W | Thermaltake Sonata | Vista Ultimate x64 SP2/Win7 Ultimate