The disk cleanup utility has another hidden menu which must be accessed by way of the command prompt. This gives you access to even more space-recovering options. To access the hidden cleanup menu, open an administrative command prompt by opening the 'start' menu and typing 'cmd' in the search bar. Do not press ENTER. Instead, right click on the 'cmd' program in the search results, and choose 'run as administrator' from the options.
Now type 'cleanmgr /sagetset: 1' and press ENTER.

A different version of the cleanup wizard is now available to you. New options include removing old installation files, upgrade files and checkdisk fragments that may be stranded on your drive.

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