Need help with daemon tool problem

[oxidda]

ok so im trying to install diablo 2 and i have the install disc but i dont have the play disc and you need both to install the game and so i put in the install disc and put in the cdkey and so forth and then it asks for my play disc so i start up daemon tools and click mount image and browse for my diablo 2 play disc.iso file and i click it and it starts to install just like its suppost to but then the game asks for the install disc again so i tried just opening my drive and putting the install disc in but nothing happens the install progress bar just sits there so...i need help i dont know what to do with daemon tools do i gotta unmount the drive or do i gotta add another drive? what do i gotta do to make it so my install disc in my drive will work? thanks guys