Could be a virus or could be the keyboard going bad. I've seen both happen. I had a keyboard once that killed the spacebar, backspace, 8 letters and some others. Replaced it and never had the problem again. It also caused some weird desktop issues like a giant green MUTE displayed in the corner of the screen.
Thanks for answering. If i can get over the other issue- the double screen- i'll get a new keyboard and see.