The built-in Disk Cleanup tool by Microsoft Windows can help cleanup your computer including system files.
Open the Windows menu and type 'disk cleanup' to access the program.
Select the items you wish you clean from your computer. Then click the "Clean up system files" button.
Select from the additional system items available to clean.
Press "Ok" to start the cleaning process. When completed, the window will automatically close.
Advanced users may select the "More Options" tab from 'Disk Cleanup' and remove 'shadow copies and restore points' to free up additional space.