i think you did not cracked the game cd
to do cracking
follow these steps
1.install the game cd
2.in your cd you can find a file called crack
3.open the crack file and copy the files in the cracked file
4.now go to start menu and open the properties of the game you have installed.
5.in properties you can find file location of the game.
6.open the file location and paste files what you have copied from the crack file in your cd.
7.now it will not ask you to insert the disk again.
8.now you can play the game