I've /just/ been through this section of the game.
Maybe try going to other places first? There are a few things to be done before revisiting the tower. If you start at the bridge, then walk into the front gates of Baldur's Gate there are a few people you should meet on those two maps (they are out in the open so you can't miss them). They will direct you to some new quests.
Oh, if you haven't gone on the Ulgoth's Beard/Durlag's Tower quests, now would be a good time to do that.
Perhaps the game needs more memory allocated to it? Or maybe your system just needs rebooting before you try again?
-Colin.
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