Never mind, I finished the game with distorted grafix. Well, that was not the only thing that did not work…
A lot of bugs make this game feel not finished at all and also customer support is not reacting to anything (I hope at least they are all bug-fixing or worse still on holidays).
Not worth the price of ~30 Euros.
Sorry, meant to post this a while back but I didn’t have access to my computer to double-check.
I finished the whole campaign running a somewhat similar setup. It worked in both fullscreen and windowed (switched to the latter to make taking screenshotseasier).