LinustheBold: I'm seeing this as well, also on Win7 64.
I discovered something interesting last night.... in my GOG owned game list, it did not say there is any update for Disciples gold. But i noticed someone posted who had purchased it recently and they said it was listed as compatible with operating systems which were not listed when i purchased it!
So i thought, "what the hell" i can loose my old saved games if there is any chance of stopping this crashing, so i re-downloaded it and re-installed it.
The first thing i noticed is the desktop Icon style had changed - no update available my ass! and although it did still crash at first, after 1 computer restart, it is solid as!!