Thanks to you both.
I mentioned twice(?) that the notebook is no in a domain and sure there is a WSUS working.
So it is impossible for anyone to change the settings for the Windows updates - they were managed by the "Administrator".
Guess, who this poor guy is...
The only thing i could to is remove the notebook from the domain and test this.
But imho it is not worth a try, we do now know, what is causing the problem.
Thanks again for your help and knowledge and have a nice weekend.
FGlas
.
P.S.: If one of you disagree please let me know. Maybe i can find a bit time to do some of the testing work in the next two weeks...