go to your disciples 2 steam folder it should be something like :
c:\programfiles\valve\steam\steamapps\common\disciples || galleans return
or
c:\programfiles\steam\steamapps\(your account name)\disciples || galleans return

scroll down and you will see a bunch of files and 3 .exe files named :scenedit, discipl2, configeditor.

click on one of the .exe files so that it get's higlighted blue. now right click one of them and click properties, now click the Compatibility tab and go to the Compatibility mode and set it to (windows xp service pack 2). repeat this for the other two exe files.

( remember to left click on the .exe file first, before you right click it for properties . if you don't you might not see the comp tab.)

comment under here if you need help on how to do this or if it worked for you.



enjoy playing , i hope i helped!! If this didn't work try my settings below V

you can go to the configuration editor screen by rightclicking disciples 2 in your steam library and clicking configuration editor.

HIGHLY RECOMMENDED SETTINGS

put the screen resolution to : 800x600
- Refresh rate: default
- Delay before an event message pops up: 500 milliseconds


check:
- Stretch to full-screen;
- Compatibility mode;
- Play sounds;
- Play music;
- Display turn counts in paths
- Snap mouse cursor

- Optional 'Use Direct 3D'. Try the game with it unchecked first and if it still doesn't work then check this and try the game again. <-- this worked for many people!!


UNCHECK ALL THE REST!!

NOW SAVE IT and you are good to go enjoy the game.

i highly doubt that the above methods won't work for you if you followed them correctly but if you are the small % where it still doesn't work you should instal the software 'fraps' and run it in the background.

now start disciples 2 and it should work. ( i can't explain how tough but it worked for many people)