Could not prepare property pages because: Library not registered.

Hello,
Whenever I right click any local account in User Manager (Local Users
and Groups) and then click properties I get the following
(informational) message:
Name of Dialog window= Dial-in Page Error
Could not prepare property pages because: Library not registered.

The same occurs on a german Windows Server 2003:
Name of Dialog Window = Seitenfehler beim Einwählen
Die Eigenschaftenseiten konnten nicht vorbereitet werden, da:
Bibliothek nicht registriert.

I can click the OK button and then have access.
Routing and Remote Access is not configured but I have other servers
where it is not configured either and where this message does not pop
up.

How can I stop getting this message?
Which library is to be registered??

Thank you

.