My computer only has 40gb left of its 160 original for some reason even though i dont have much installed in it…all i need are the pics of me and my girlfriend ( not much more than 1gb) and all my school related files ( less then 100mb) both of which i am saving on my Flash Drive. I just want to know how do i clean it up and how many times i am supposed to do it since i heard something about having to do it 7 times…please explain.