Windows 8 CP keyboard self typing bug; Please help!

Hey all, I have Windows 8 Consumer Preview installed on my desktop(custom built) along with Ubuntu, and a major bug has just reared it's head. I booted up my computer and on the lock screen where you enter your password, as soon as you select the text field for the password it start's typing +'s endlessly. I can't get it to stop, and obviously I can't enter my real password and log in. This occurs even if I unplug my keyboard and try to use the onscreen keyboard.

I'm at a loss here, any help would be greatly appreciated!