So when I'm playing a game, one of the arrow keys acts like it's been pressed (I've only seen it with the left) and so my game acts like I've pressed that key. It's only noticible in games that use the keyboard. It's annoying, and makes me lose games. It's an old Microsoft Natural Keyboard Pro (not sure how old it is). It does work with Vista, or else I wouldn't be able to type. I think the key is getting stuck. The keyboard is dirty. Anyone have any suggestions?