system
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You didn’t say which OS you are using. This link, at Major Geeks, might give you some insight. http://forums.majorgeeks.com/showthread.php?t=74220
Don’t format your hard drive, there are other ways. Ever try system restore if you have XP?
In addendum this might also be a worthy read: http://forums.cnet.com/5208-6142_102-0.html?forumID=5&threadID=232457&messageID=2396828