After some time i tried reinstalling gothic II Gold but now i dont have enemy health bars and i cant find an Option to turn those bars on. I'm using Windows 8 x64.
I had the same problem until i found a fix from GOG wiki, if it doesnt work you can make your own fix with Microsoft Application Compatibility Toolkit, helped me a lot.
Here`s the link http://www.gogwiki.com/wiki/Gothic_2_Gold_Edition.
This works if you have the problem where the screen doesnt display correctly