Can't open Nautilus or Terminal.

So, ever since I did sudo apt-get upgrade, my laptop has been screwed up. The clock is just white rectangles, all the stuff on my desktop vanished, I can't open Nautilus (file manager), and terminal isn't working. It just won't open, it'll load, but won't open. If I do something like lets say, upload an image on imgur, I can still view all my files, I just can't change them. Please help me!