Welcome aboard, Rev. Beetle. You say you are getting a complete computer reboot, not just a crash to desktop? I'd be wondering about a system problem of some sort, or a really bad driver problem. What kind of power supply are you using? Which XP service pack are you using (SP1, SP2 or {heaven forbid} SP3)?
Also, when you installed the game, did you let it install DirectX? If not, when was the last time you updated DirectX?
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