i ve done it yesterday but meanwhile i found the answer to this problem (thanks to Asani)

Originally Posted by Asani
If all methods like uncheck UseDesktopResInFullscreen="0" etc. has failed, try this: in Nvidia Control Panel --> PhysX Settings and then Processor for PshyX, select Processor(CPU) not GPU.

...


so now i could now discover the world of divinity 2