Okay, so some time in the past few days I'm guessing I contracted some kind of virus. I started up my computer and I went to click on Firefox. The icon just disappeared. I then decided to try ctrl-alt-delete to check processes or something. Nothing happened. I basically can't do anything, even clicking shut down in the start menu does nothing. After I log on to the computer all I can really do is stare at the desktop. I have no clue what to do, your help would be greatly appreciated.