hi there seems like your not the only one that had problems with driversweeper
you can read that post but no found solutionhttp://forums.guru3d.com/showthread.php?t=279238
From what i read you have to reinstall windows cause file got corrupted....
or maybe you download a false driver sweeper and was a trojan in it....
anyway reinstall windows without formatting to see if it works.
if it doesn't you'll have to backup and do clean install.