Are you using Windows XP Professional? If yes, we can try using
remote access to control your computer and re-enable
everything.
If no, you have to hunt around for a serial port keyboard. I have
to say that this kind of keyboards are really rare, so rare that I
have no idea where to find them.
Note that serial ports have 2 rows of pins, instead of 3 rows which
are for monitors. If you are able to get such a keyboard, plug it
in. If the computer beeps or give you a warning that no keyboard is
detected, I'm sorry to say that you have to reformat.
Try starting up and see if you can enter.
If yes, try this: