Two keys on my keyboard won't work. How do I fix this?

For almost a year, my A and S keys haven't worked, and I have to use an on-screen keyboard which is a pain. I think I finally found the reason, but I have no idea how to fix it. In the picture, to the left is S and to the right is D. On my S and A key, the part that you press is raised. I think this is why it... show more For almost a year, my A and S keys haven't worked, and I have to use an on-screen keyboard which is a pain. I think I finally found the reason, but I have no idea how to fix it. In the picture, to the left is S and to the right is D. On my S and A key, the part that you press is raised. I think this is why it doesn't work. How do I fix this? Or is this normal, and my keys don't work for a different reason?
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