[QUOTE=Btw. we may both be in trouble as this thread should have been in the hardware forum...

[/QUOTE]
Excuses when I posted this in the wrong thread, but anger and frustration made me blind!

I changed the settings of my gpu and the game settings itself. The game is running now, not as fluently as it was ment to be, but it´s playable.
I had to give up my PC as I will become a proud father soon and I had to give up my home office to turn it into a Baby´s room.
Hope there won´t be too many "Aaalaarm" shouts in the upcoming nights to keep me alert!
Beste Grüsse and cheers to my Danish friend,
Kurfürst