Start Windows Explorer

--> Double click 'My Documents'

--> click the 'Folders' button

--> click on 'My Computer'

--> Right click on the 'Local Disk(C:)' or 'C drive(C:)'

--> click 'Properties'

--> click 'Disk Cleanup'

--> wait a short while......

--> check all the boxes

--> click 'Ok'

You are then asked --> 'Are you sure you want to perform these actions?'

--> click 'Yes'

--> click 'OK'