Well, if you have a brand new copy and a good internet connexion, you can download Stardock Central, register your serial Id and download the whole game.

 

Sometimes another way is to copy all the discs onto your harddrive, install from there, then delete the files you used to install from. I remember I had to do this with a certain MMOG's discs. This only works if the disc itself is fine and it's a computer file transfer problem.

All depending on your computer, it may be a simple checkbox that needs cleared though. My friend's Dell XPS had something that needed unchecked to make his drive accept multiple disc installations....go go Dell!!!