Age of Empires Gold: Game does not detect CD

I successfully installed Age of Empires Gold onto my vista computer, but when I get to the game menu and try to start a single player game I get a message saying that I need to insert the game CD and restart Age of Empires, even though the CD was in there the whole time.

Now I did upgrade from XP to Vista, so I suspect that the CD drivers/drives are somehow "off" and that the game's "CD check" software doesn't detect it. I also have two CD/DVD drives.

Please Help, thanks!