Disk defragmenter is program that comes with Windows Operating System to help improve performance. The hard drives running Windows can get fragmented over the time, means a bit of information is scattered all across the hard drive making it harder to find information. After defragmentation you can see the speed difference. Follow the simple steps below

Click the Windows Start button.

In the search bar type in disk defragmenter and click on the program link to open it.

Click on Defragment disk button near the bottom.

The program will begin analyzing your hard drive and begin defraging.