Problem, who can pls answer in german

I have the game installed perfectly normal and often played. Then I have times changed in the resolutions which, since my PC can represent it better. then again when I introduced a change in the resolution, the following happened: I have a wide monitor from ASUS right, and he was "out of sight / reach. and since then I can not play it, because once I start it is only a black screen and it can not be displayed. but taskmanager and I can minimize or close it. But go inside as I change the resolution without even having to? have also been installed again but no avail = (. the game is really great

if it is possible you please reply in German, I can not so good english thank you in advance for reply