This is what I do. Turn off screen saver. Anything I can close in the task bar I close. First you scan disk, its in system tools same as defrag (three down). When you start defrag it first checks for errors on the hard drive, which is why you can be seeing it restart over and over. I've seen where it keeps restarting beocz its finding errors on your hard drive if you dont scan disk first. After it scan disks, run defrag. I dont even use safe mode and it takes about 10-15 minutes. Try it, lemme know
