error message when opening studio

Dear Colleagues, 

I 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.)

Jerzy suggested to run the repair routine in Windows, but when trying I got another error message:
"service 'SDL Customer Feedback Service' failed to start. Verify that you have sufficient privileged to start sytem services." 

Can anyone help with this one, or has any idea for another approach?

Many thanks in advance!

Best wishes from Munich, Isabella

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