How could I play this game? (see detail)

OK guys I’ve bought this DVD named ”Zoo tycoon 2 zookeeper collection” (Zoo tycoon 2 game with its multiple additional versions inside). I’ve installed this game,dirextx,and all that necessary requirement. The problem is when I try to play this game it asks me to insert that DVD disc. I’ve inserted that disc but it keeps asking me for that disc. I can’t play at all. So,how could I deal with this thing?. I’m using Windows XP if you wants to know,and my PC is still fine and updated. I still wants to play and I really needs your help. Thank you.