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.

I have to use the onscreen keyboard

What "onscreen keyboard" are you referring to?

Given everything you've described, I'd try a different keyboard first; it sound's like yours might be getting flaky.

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