If you want to clear everything off your laptop or computer you must reboot it, you should know that while the computer "cleans itself up" it will take quite a while until you will be able to use it again.
Safely: You can just reformat the hard drive using built in software Alternative: The magnet trick always work but its STRONGLY NOT recommended as you're almost guaranteed that something else will be...
Go to the files you want to delete and click delete that will send them to the recycling bin. Delete them from there and they're out of the way. The good side about this is that if you suddenly need...