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if i were you i would do a low level format that will zero kill the hard drive, killing off all data,if you wish to go a bit further take the battery out of the mother board which will kill eeprom resident bugs and then reset bios reinstall windows with service pack 2 get all updates and make sure you have good security software installed, that should kill any root kit, be carefull when installing anything you have backed up as that could also be infected.