Itlodeo: Sorry, my suggestion was erroneous. I had the same problems, but in a strange way.
I had almost no problem with the Mountain clan campaign, so I believed that was the solution. Now I'm playing with the Empire campaign and the game crashes frequently.
There is another strage thing: in the same scenario after a period of continual crashes, suddenly they stop.
I'm currently playing the Undead campaign....and you could say it's killing me. :)
Your suggestion did improve my graphic performance oddly. My native screeen resolution, initially, started the game in the smaller windowed mode. Using the config that comes with the download, and maxing out the options, I can play a full screen game but most times my into movie graphics colors are just all over the place. Also I find the crashes are more frequent. By using the icon in the game folder I get the full screen version without any graphical kaleidoscope.
Strange.
Time for an update.
I have NOT solved this issue. I have made it less noticeable. Hopefully this will help anyone else experiencing this same annoyance.
After installing the game ensure that it is being run as an admin., in compat. mode and that ALL other options for display and colors etc are checked. Next, right click on the desktop to open screen resolution option. DON"T DO ANYTHING just leave it open on the desktop. Only then can you start your game and not have crash every other turn........just once every 10-15 turns or when you try to quit out of the game.
Also, I did notice that with the re-launch of GOG many, many games has a compatible with Win 7 designation on their game card.
Disciples Gold is NOT one of them. Buyer beware.
Good luck.