How to Defrag Windows Vista

Scheduling Disk Defragmenter to Run Automatically

1. 
   Click on the Start menu, then click on 'All Programs.'
2. 
   Click on 'Accessories,' then click on 'System Tools.'
3. 
   Click on 'Disk Defragmenter,' then type the administrator password to confirm you want to open Disk Defragmenter.
4. 
   Click on 'Modify Schedule,' then indicate how often you want your hard drive defragmented. You can select the frequency and time of day during which you want Disk Defragmenter to defragment your hard drive.
5. 
   Click on 'OK,' then click on 'OK' again to confirm you want to run Disk Defragmenter to run on the schedule you indicated.^[2]