Whenever I turn on the computer, it automaticlly gives me an error saying that I can't log on (I am the admin.) Also, if I hit any key everything freezes and I have to force shutdown to do anything. The only way that I can log on is by hitting f8 when I restart, (it says keyboard failure, but still goes to the menu screen) I go to last good known configurations, log into the guest account for atleast 45 seconds, then switch to my account (without logging out of guest) and I have to use the onscreen keyboard. There were no problems with any of these things before so I don't know what to do.