Thanks for getting back to us @Gluiperd13 - I've removed the screenshot from your DxDiag for privacy reasons, however if it comes to it we will ask for these files via a private channel.
Are you currently using the most up to date drivers for your GPU (I was unable to confirm this as the date was cut off).
A new GeForce Game Ready Driver ver. 571.48 was released on 27th September - could you please ensure you've got this installed: (https://www.nvidia....