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Disk Defragmenter, as the name implies, defragments your disks. Your disks get fragmented when you add and delete files, because information that should be grouped together gets split up. When you defragment your disk, all of this information gets grouped back together. You should run ScanDisk before using Disk Defragmenter. To run Disk Defragmenter:

* First disable your screen saver.
* Double-click on My Computer.
* Right-click the Drive that you wish to defragment.
* Click on Properties.
* Next click on the Tools tab.
* In the Defragmentation status box, click on the "Defragment now…" button.
* You may get a window telling you that your drive is fragmented only a certain percent, and that you do not need to defragment it at that time.

If you are defragmenting, this will take a while. You can multi-task, but Disk Defragmenter works much more efficiently if you leave it alone.