Something's fishy about my computer lately

As of now, out of nowhere; my computer has been acting weird. The font has been changed to that slanted look (which I didn't ask for), and there are times when my update client just stops working, and so does my microsoft word processor, just when I paste a text. One thing though is that this seem to have started after I updated my Malwarebytes' Anti-Malware. The reason why I did a virus scan was because one forum site I go to, for some reason, had a diffferent user name on which wasn't mind, and thus I got scared. After I did the update, that when all this happened. Plus, I did so virus scans with both Malwarebytes as well as Security Essentials, and found nothing.

What could have happened? Please help me out.