I wanted to start playing a game that i used to play back in the day. The problem is it requires 2 CD KEYS, one for the original game and one for the expansion. I have all the cd's, but no case's, therefore I don't have one of the cd keys (expansion). My question is, is there anyway to view what cd key is being used on my old computer where it is already installed, so i can install it on my new computer?