|I don't know if this will help, but try to check and see if you can enable your keyboard from Device Manager. Get there by:|
It may show a ! or X going through your keyboard. If it is an X, then the keyboard was accidentally disabled, so double click the keyboard, then at the bottom of the Properties Box, you should see Device Usage. Change it to "Use This Device (Enable)."
Now if you have a !, this gets exciting. It means that the driver is corrupt or missing, or some kind of other error (Look for it in Device Status). For the driver, you have to find a driver somewhere on the internet or something. I don't know about any other errors, so this is all I have.