error message when opening studio 2017

Dear Colleagues, 

I suddenly can no longer open studio 2017, the error message is:

"Die Datei oder Assembly "System.runtime.Serialization.Formatters.Soap, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" oder eine Abhängigkeit davon wurde nicht gefunden. Im Modul wurde ein Assemblymanifest erwartet."
(The file or assembly "System.runtime.Serialization.Formatters.Soap, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" or a dependency thereof was not found. An assemblymanifest was expected in the module.)

Can anyone help me with this one? License is OK, and studio was working fine just until today.

Thank you very much in advance!

Best wishes from Munich, Isabella

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