This video will show you how to defrag your computer's hard drive to increase its speed. To defrag your hard drive, do the following: Go to 'Start', 'All Programs', 'Accessories', 'System Tools', 'Disk Defragmenter'. Select the hard drive that you wish to defragment, and select 'Defragment'. Depending on the size of your hard drive, this process could take between one and two hours to complete. After the process is complete, your computer will be uncluttered and will hopefully run a little faster.