How often should you run the disk defragmentor? I ran this about 3 weeks ago and it did fine, however, when I tried to run it again today it wouldn't do anything. It did go to 1% then to 0% then to 1%...kept going back and forth like this for about an hour. I also tried a scandisk and this produced nothing either. I did not have any programs running at the time and I only have a 2.1 GB, so I would appreciate any help I can get.