So a friend and I found a XCom CD-ROM with all 3 games on the CDs for a whopping 4.99 USD, and when I load it on my computer (with Vista), it installs fine but has no graphics.  I can hear the game running, but can't see the game. 

Now, when I installed it, it asked if I wanted to load DirectX6.1 and I said no, because its older.  Would downgrading the DirectX make any difference, or does anyone know if there is a link or some such thing I can install to make the game compatible with Vista