Disk Cleanup
Disk Cleanup is used to cleanup any unnecessary files on your computer. This doesn't mean files that you have saved such as documents or music.
Step one
Click the Microsoft Windows Button as shown Below. Note: If you are using Windows XP click the start button instead located in the lower left-hand corner.
Step Two
Type Disk Cleanup in the Start Search box then click the Disk Cleanup under programs as shown below. Note: In windows xp you will need to navigate to Disk Cleanup by Highlighting ALL Programs>Accessories>System Tools> Then Click Disk Cleanup.

Step Three
Disk Cleanup will begin scanning your system as show below.

Step Four
Check all boxes on the left-hand side then click OK.

Step Five
Click the Delete Files button on the prompt that you receive shown below.

Step Six
The system will then begin to delete the files off of your system. Allow enough time for it delete the files. The window will automatically close when it has finished. Below is what you see as it is cleaning.

