Hi Pam,
You might be able to install both games as long as when it's installing it will have something like C:\Program Files\VirtualFamilies as the place where it is going to be installed. Before clicking next to install the game change the name to something like C:\Program Files\VirtualFamilies2. I think you could have actually done this with just the one game you purchased from LDW. A pity you wasted your money!