Numbers and other characters not appearing, entire computer

I started up my PC today, and have since restarted to see if that would help, and numbers and many characters are not being displayed. Here's an image (http://i.imgur.com/KLz9fTh.png) You can see in the address bar that ". : /" characters do not show, as well as the blacked out shapes that show instead of the letters and numbers of the web address. Many many options are not showing in any...