Random Restarts

[chisness]

hello,

on my dell i play poker on i have no problems at all, but on my other homebuilt computer (i wonder why it has problems [img]/images/graemlins/smile.gif[/img]) it seems to simply shut off every few hours

when it shuts down in the case i actually tell it to, it says theres been an error with Normal.dot not saving and when it starts up after randomly shutting down it says windows has recovered from a serious error

this is an xp system with 1 gig of ram, 3.2 ghz p4, and geforce 6800 gt -- could it be overheating or be some kind of software problem?

suggestions appreciated

thanks,
max