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ChrisSD: I have no programs that capture or remap buttons

I've even tried in safe mode. No dice.

My anti-virus is just the Microsoft one.

If I shred my keyboard to pieces and feed it to the nearest Dell or Microsoft employee, would that help?
How old is your keyboard? Could something have gotten underneath the key and is preventing from registering the fact that you are pressing it? Not trying to be facetious, just trying to eliminate any possibilities...