Unfortunately, I can not think of anything that wasn't already mentioned in the links I gave... maybe topics specifically for D2:ED might help:

First Aid Kit for Divinity II

First Aid : when Div2 does not start or crashes

Theory on my CTD at the Start New Game Load Screen


You can email supportegodraconis@larian.com, with your dxdiag and the file from the support tool, but I don't know if they would have any other suggestions.