Image via CrunchBase

To delete files using Disk Cleanup

The following procedure cleans up files associated with your user account in Windows 7. You can also use Disk Cleanup to clean up all the files on your computer.

1. Open Disk Cleanup by clicking the Start button . In the search box, type Disk Cleanup, and then, in the list of results, click Disk Cleanup.

2. In the Drives list, click the hard disk drive that you want to clean up, and then click OK.

3. In the Disk Cleanup dialog box, on the Disk Cleanup tab, select the check boxes for the file types that you want to delete, and then click OK.

4. In the message that appears, click Delete files.

Source: http://windows.microsoft.com/en-us/windows7/Delete-files-using-Disk-Cleanup