I've got the same problem, run the game, opening video works, sounds works, no video. I tried different graphics options and nothing changed. I ran the game in the game's "safe mode" and it ran okay, but with minimal graphics options. I updated my graphic drivers, I've tried the March 2007 Windows Vista update, as well as the Windows Vista ForceWare Driver Installation, and both said that there were no updates to make or were incompatible with my system. I'm running genuine Windows Vista Home Basic 32-bit. Anyone else know what to do?
EDIT: I'm using an nVidia GeForce Go 6150 GPU. When I get past Oakvale for the very first time even in the game's "safe mode" the graphics don't display again.