After that you will be able to remove irrelevant data from your disk, including downloaded windows updates, temp-filese, your deleted files and so on and so forth. It then checks for files to delete, just give it a moment.
click the lower-left button called 'clean up system data', or something similar in meaning.
It's actually pretty easy: go to Computer/PC, then right-click the C \ drive, in the context-menu choose the last entry named Properties.Ī window should now appear giving you kind of an overview of your free space etc., just click the button that sais 'clean', or 'clean up', or something like that.