Call of Duty 2 PC error PLEASE HELP?

I recently started to switch most of my old games from my old (broken) compy to my new system. Unfortunately my copy of Call of Duty 2 is not working. It installed just fine, but when i try to run the singleplayer, an error message pops up. The message reads "please insert the correct CD-DVD ROM." This would be all fine and dandy to fix unless of course I DO HAVE THE RIGHT CD-DVD IN!!! I never had this problem before and as i said earlier... this game ran just fine on my old (now broken) computer. please help!