1. Free up disk space 
By freeing disk space, you can improve the performance of your computer. The Disk Cleanup tool helps you free up space on your hard disk. Tip: Typically, temporary Internet files take the most amount of space because the browser caches each page you visit for faster access later.

2. Speed up access to data
Disk fragmentation slows the overall performance of your system. When files are fragmented, the computer must search the hard disk when the file is opened to piece it ...