The event viewer is in everything after Windows 2000. To check it, rt. click on My Computer and go to Manage. Click the + symbol next to Event Viewer and click on System. Anything in there out of the ordinary that you can tell? Red circles with white X's in them shouldn't be happening on a regular basis if there are a lot in there.
Is the machine in an enclosed cabinet of some sort? If so, it's quite possible it may be overheating. Even if it's not in an enclosure, does it have plenty of ventilation that you can tell?
Windows XP won't use memory that it thinks is bad, thus causing it to restart several times a day. What I'm saying here is that if Windows XP hits a bad area of ram whilst running, it will log it on shutdown. If it's a part of ram that Windows doesn't use upon booting, it will not use it while running. That way, it won't keep restarting because of ram that it has told itself not to use. This is why I don't think it's a memory problem.
I doubt it's a power supply problem, because _usually_ the power supply would just make the machine lockup. The power supply has no reign over the rest of the machine to tell it to reboot itself. Software controls hardware, not the other way around.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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