Lightroom CC doesn't start ... no process no popup of the loading screen

I've just installes Lightroom CC and it doesn't start. I searched the forum for some suggestions, but my problem is, that NOTHING happens...no pop-up, no process in the task manager, nothing. Logging out and in in the CC-App doesn't solved the problem

Hi exposurephotography,
Try signing out of the Creative Cloud Desktop application, then sign back in: helpx.adobe.com/creative-cloud/kb/sign-in-out-creative-cloud-desktop-app.html
Regards
Pete

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