Restart your computer and then do an F8, and if you are running windows xp or me, then you need to turn off the system restore before you do this, so you don't go back and start the virus all over again.

If you are running xp or me then, and you can remember the last time you computer run smoothly then you just might could do a system restore. That is if it is not a virus. In a way it sounds like you may have some missing files. What operating system are you running?