Key Board Dun Work <_<

Before logging on to an account? Not that I know of. o_o

Ah, I see you're using Windows XP. Well, I'm assuming that some of your USB ports are still working, or you should hope that some still work. Then login as usual, and turn on the On Screen Keyboard (Start > All Programs > Accessories > Accessibility > On Screen Keyboard). Then switch your keyboard to a non-working USB and follow the steps I described.

It sucks that you're using Windows XP. From what I can remember, there aren't any ways of turning on the On Screen Keyboard from the Login Menu which basically screws over anyone with a broken keyboard.