Blaze72: I gave up trying to fix this game up to work on Windows 10.
Go to this page & it'll fix you right up.
http://www.moddb.com/mods/lhiver-en-edition here's some of the pertinent text:
Installation:
1. Install the game: Gothic II - The Night of the Raven (Gothic II: Gold Edition)
2. Install the following fixes into the game root folder (typically: C:\Program Files (x86)\GOG.com\Gothic 2 Gold or C:\Program Files (x86)\JoWooD\Gothic II\):
- gothic2_fix-2.6.0.0-rev2.exe (
http://www.worldofgothic.de/dl/download_278.htm)
- gothic2_playerkit-2.6f.exe (
http://www.worldofgothic.de/dl/download_168.htm)
- g2notr-systempack-1.1.exe ([url=http://forum.worldofplayers.de/forum/threads/1340357-Release-Gothic-½--SystemPack-(ENG-DEU]http://forum.worldofplayers.de/forum/threads/1340357-Release-Gothic-½--SystemPack-(ENG-DEU[/url]))
3. Install the L'Hiver mod:
- extract the contents of the package into the game root folder
- overwrite the files when asked (may want to backup Gothic.ini)
4. (Optional step) Download and install DX11 rendering mod ([url=http://forum.worldofplayers.de/forum/threads/1436307-D3D11-Renderer-für-Gothic-2-(alpha)-13]http://forum.worldofplayers.de/forum/threads/1436307-D3D11-Renderer-für-Gothic-2-(alpha)-13[/url])
5. Run the game as Administrator
I've been running the game trouble free on Win10x64 for many months, now--it runs great. But you *have* to install the 3 patches listed under #2 above--because these patches allow the game to run fine on current OSes.
Information on the L'Hiver page I linked for you is the most current available. Some of the info in the stickies here, though, dates several years back and is woefully out of date--some of it is OK, but this is really all you need to get the game up & running. Gog should really address the info in these really old stickies and get rid of the obsolete content.
For instance--these patches are light years ahead of the IronKeep patches, which really aren't that good at all for G2.
This should fix you up!