There are a few possibilities:
- Corrupted Temp files (easy fix)
- Corrupted Save Game (possible fix)
- Unstable mod (you're probably done for)
Go into the folder where you installed Baldur's Gate, and then clean out the Temp and Cache folders. (Don't remove the folders themselves; just remove everything in it.) Then try the game again.
If this does not work, try to reload a save game from a point where BG was not (yet) crashing, and play from there. If you still have crashes and have mods installed, one of them might be unstable, or you might have installed in the wrong order. Mods are a tricky business, and can work against each other (even when they are all WEIDU mods.)
I had to abort my last run (EasyTuTu) because I hit an unresolvable crash frenzy after Cloackwood 3. My current game is modded very lightly (replaced GOG's directdraw fix with the newest one, and installed a GUI that supports 800x600), hasn't crashed yet; I did everything that can be done before Cloackwood 1, except Durlag's Tower. I'm crossing my fingers that I can make it through Cloackwood this time, and finally finish Baldur's Gate one more time before I move on to BG2, and then, to other games....
So in short: if cleaning out Temp and Cache, and returning to a known good save game does not resolve this problem, my suggestion would be to restart the game and install as few mods as possible; I'd even recommend to forego EasyTuTu and BGT, and just use the WideScreen Mod and TWMGUI to get 1024x768. EasyTuTu and BGT change gameplay way too much, IMHO, and cause gameplay imbalances.
(To be honest, I do feel a little 'stuck' sometimes, trying to replay BG1 over and over again, for 10 years in a row, with different mods, and then having to abandon the attempt due to instability, never actually getting to BG2 with the characters from BG1 :X)
Post edited February 21, 2015 by Katsunami