Strange problem, random re-starts

Right, here's the story

My shuttle with WinXP Pro + SP1 was running fine for months 24/7 downloading stuff e.t.c, I then installed SP2 as a seperate file and everything was still fine.

Recently I've done a slipstream CD with SP2 already on it, after re-installing WinXP with a fresh format on the shuttle, now here's where the problem start.

With this new installation it seems to randomly re-starts for no apparent reason. I thought it might be a dodgy CD, but my brother has used the same one for his comp and it's fine. Could it be a bad install or has anyone got some ideas for this?

Are there any error messages or odd stuff in the event log? Does the same occur if you install using your original CD and apply SP2 as a separate install? If the latter doesn't occur, I'd still suspect the CD.

Windows XP automatically restarts when it encounters a system failure. You can turn this off if you wish: Right click on my computer > Properties > Advanced tab > Settings -start up and recovey.

I had a similar problem when i first had windows XP (original version). I done this and the problem went away, however instead of restarting the system it just displayed a gloryfied windows XP blue screen of death or GWXPBSD:P. This may be the reason why your system restarts, but i dont know for sure.