Solutions
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sebek91's post in I bought a new graphics card, installed drivers and LCPDFR is not working anymore was marked as the answerWhen press Open folder - diagnostic tool stopped working :D
But problem was solved, it was that fuc* Visual C++ Redistributable for Visual Studio 2012 Update 4 x86
That also reminds me that I had the same problem few months ago, but I just couldn´t remember which file it was ...
So thank you for your help ! And I apologize for wasting your time :/ This was such a begginers mistake ...
Have a nice day and stay safe on patrol :)