Problems w/ game Civilization on Windows Media Player

Hello all, I put in the cd-rom game for Civilization and when Windows Vista
came up I accidentally asked it to play the music from the cd instead of
allowing me to play the game, so Windwos Media Player automatically comes up
now every time I insert the cd. I have shut the system down and restarted
and it still will not allow me to play the game. Could anyone help me out
please? I would appreciate it, I am not computer savvy, thanks!