Office-Addin not visible

Hi

I wrote a .net Add-In. Now when I install the Add-In on a Computer
with Admin-Rights, there is no problem. But when a autmatic installer
installs the program for a user with normal user rights, the user
cannt see the registered addin.

has the user not enough rights to start the addin-in or what could be
the problem.
thanks for any help
zp