So the '..\Documents\Larian Studios\Divinity Original Sin\Mods' folder is empty.
Same for '..\SteamApps\common\Divinity - Original Sin\Data\Mods'.
Yet even when starting the game as administrator directly from the executable you still get the error?
I know you re-installed, but try verifying local files and see if that has any effect.
I just remembered I had several test mods and deleted them. Now it runs fine. Thank you!