agrees, if you cant find anything via a virus scan then do a complete disk check. It doesnt sound like it will be a hardware problem as you can run everything fine for the first 30mins...
Also next time you get an error message get microsoft to do the crash report, it should analyse the problem and send you to a crash recovery page telling you the problem (if it recognises it). The only option after all that (and the one I always hate saying) is a complete reformat and see if that solves the problem
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