Diablo 2 Play Disk

I downloaded the Diablo 2 Play Disk off Limewire, and everytime I try to play the game it says Please make sure the diablo 2 play disk is in your CD Rom Drive, then click on retry. Can anyone tell me how I can get this to work? Ive searched threads but nothing has worked yet. :S

Btw
I used Nero 6.0
hp dvd writer dvd420i

Read this and this and then run down to your local shop and buy the game.