When I attempt to lunch the Installer application to install AF7 it simply crashes. The disk seems fine and I installed it on the same computer once before (a Mac OS 10.4). I reinstalled the Design Premium Suite with no difficulties so I don't think there is anything wrong with the Installer.
Well, maybe you should have installed in reverse order. Installing CS3 products before older versions surely must have some odd side effects, even on a MAc. Did you use the CS3 clean scripts before re-installing everything? Also make sure to clean out all OSX caches for fonts, application pre-fetch and so on. It's possible some odd data still lingers. Tools like OnyX can do this for you with a graphical UI.