When I try to change the settings with the graphic mode setup.exe I always get the message "game not installed" when I try to save the changes.

I already tried to reinstall the game, but it dowsn't work.

Can anyone help me?

Strange, though you can always edit the game's config-files manually. They're called 'dosboxULTIMA1.conf' and 'dosboxULTIMA2.conf', and should be located in the game's main directory.

This page describes which settings alter what. The most important values you'll probably be wanting to edit are called output, fullscreen, aspect and scaler.

Are you trying to run them directly from the game's directory? If so, you should instead run them from the shortcuts in your start menu

Thank you, had the same issue, but then I ran it fine by using the shortcut in the start menu :)

Thanks. Now it works fine and I can change the settings. :-)