Awesome! Thnx Adalwar! That seems to be the trick! I kept changing ownership, but forgot to set the full permissions to the user!
Thnx to social forum of Microsoft and TenForums:)

Darn, took me...

No, this looks ok to me. As long as you trust the application, you should be fine. :)
Don't forget to change the ownership back in your registry. The site you mentioned doesn't warn you about that....

Thank you very much! Really helpful to solve my 10016 issues!