Jodokai

I'm new so be gentle. I did the BiG World Recommended install, and started playing BG I and everything seemed to be going fine. As I get further in to the game, it starts becoming REALLY unstable. If I go to Kalhid's inventory immediate Crash to Desktop. I went to the farmland with the Ankeg's to get Ajantis the Paladin, and the whole area is REALLY choppy. As soon as I leave that chunk everything is fine again. If I go into Ajantis' inventory, the game completely locks up and I have to trick it into letting me into windows so I can shut it down.

All I've done was run the automatic installer, I didn't unpackage anything... was I supposed to? I don't know any help would be appreciated.