I am having problems with some apps not starting

[Thomas Berber]

For some time now, some apps on my windows 10 pc stopped working notably spotify, skype and mediaplayer. When i try to start these apps get an error stating I dont have access to the corresponding files. Starting in admin mode doesn't work. I can't reinstall Spotify because the deinstall-button int the search panel is greyed out and it doesn't even show up in the control panel. Please help!

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