Something Is Really Screwed Up With My Client... I Can't Access Anything.

First time I tried to start League, everything seemed fine. I logged in with my username and password. As soon as I entered the League client, none of the images of anything showed up. When I exit out and tried to restart the client, nothing happens. Not even the login screen loads, nothing. I tried restarting my computer and then the client, and still nothing happened. What the heck do I do?