Keyboard typing oddly.

I'm currently using a icrosoft Ergonomic Keyboard 4000, and have had it for quite a while. But for some reason, when I got on to type today, it started doing something odd. Im using a different keyboard now, but I'd really like to use mine again. Here's what its doing.

aaabbbcccdddeee ff f `g`g`g-h-h-hiiijjjk1k1k1l2l2l2mmmnnnooopppqqqrrrssstttuuuvvvwwwxxxyyyzzz

and many other keys are messed up. Is the keyboard just going bad? Or did I hit something.