my crossfire makes my pc reboot

every time i launch crossfire it makes my pc reboot, i`ve tried rebooting, reinstalling and system restoring,after i`ve restored pc to spetember 10, i reinstalled and it worked, but the next day whan i came back to play aigain, it didnt work, i`ve also tried fiddling with the hard drive , i have already 4 z8games folders i have a windows xp, and a 2 gig ram so it should work, plz if a gm reads this, plz send me something that would make my game work aigain, my pc fits all the system requirements, but there is no virus on my pc.
is my pc treating crosfire like a virus?

well you got the point, tell me what to do,

some of you may already have read this, i have not tried ccleaner yet.

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