Also Disk Doctor and Speed Disk can play MIDI and MP3 files while it works. Kind of nice to listen to musical tunes while the software fixes problems for you.

Also the System Doctor was able to fix some invalid registry enteries, and found at one time over 1000 invalid and missing registration enteries for one of my mother's friends who had major scanner, and printer issues. Once those 1000 registry errors got fixed, her scanner and printer worked again. Without it, I would have had to RRR the system and hope that we backed up all of her data files before we RRR.