I recently had to reinstall windows b/c of some virus that my comp had. It's been like two times already that I have reinstall windows. Now that I am trying to activate WIndows once more time but I receive an error telling that I have exceeded the activations for the key that I have. It's an original cd that I bought directly from a retailer store. Do I have to buy windows xp pro again? Or is there any way that I can get another key?