In the extracted save folder, you can delete the level cache file for levels you have not been to yet, which should help when you get to that point in the game.
You can try making a backup of your save save folder, then deleting the Luculla Forest level cache file, to see if that will avoid the crash. That can cause problems with resetting quests, opponents and items, etc, possibly causing other critical problems even if it fixes the crashing.
Do you have any backups of your My Documents folder, where you may be able to recover a version of the save before first entering Luculla Forest? That would be a safer point to remove the extra level cache files. Do you have Windows shadow copies enabled, if applicable? Try right clicking the save folder, select Properties and (if available) switch to the Previous Versions tab to see if there are any copies (though it may have been overwritten too many times since then).
