Admin password required @ silent update

I get a popup to enter admin password for the installation file every time an update occurs.

I have silent update set, but this is not silent at all!

The PC is used by a different user then admin, so I need to give him my password? I cannot beleive this is true!

I want to make a setting to grant access for this "installation" only once, so that the popup does not appear.

I would expect that more people have this issue, but it's not. So maybe I may have set/not set something during installation?