One person with a crash moving from Farglow to Broken Valley avoided the problem by temporarily switching to window mode (
Solution to crash (black screen) on XP).
To try, open the graphicoptions.xml file in a text editor, and in the line
Fullscreen="1" change the 1 to a zero, save and restart the game.
In XP this file is in the folder
C:\Documents and Settings\ %username% \Local Settings\Application Data\Divinity 2\Profile
or in Vista / Win 7
C:\Users\ %username% \AppData\Local\Divinity 2\Profile
You may need to set Windows Explorer to show hidden files and folders (
XP, Vista,
Win 7).