Could be bad mountings or an install error. I’m assuming you’re using your own ISO file, created from your own physical copy of the game…? Because downloaded stuff is broken quite often, and causes a whole lot of issues. If you want to make sure: the GOG version of Dungeon Keeper Gold (5.59 €/$) is running fine. I’m running the DOS version, with Alt+R ingame to switch to SVGA resolution.
Are you using expert settings? If so, could you please post the whole contents of your config?
If not, could you upload your Dungeon Keeper .mgc file somewher (Long press game icon -> Export, file is stored in /sdcard/MagicBox/Exports) and post the link here?