I am running into a similar issue to jake. When I try to install the demo, I get the popup, but it will nto let me press ok at all, instead I just get the busy cursor until such time as my PC completely crashes and has to be re-booted. IE is the default, I am running XP Home with all service packs.
Like jake, I am looking forward to seeing some of the great locales I loved so much again. Who kknows maybe I will even run into some of my old guild mates from Galileo.