Installing an Add-In

[Smitty]

I'm having an issue installing an Add-In with Access 2010 (Helen Feddema's LNC Renaming Add-In). When I try I get this error message:

You do not have sufficient security permission to install this Add-In. Contact your system administrator for assistance."

The only thing is that I'm set up as an admin on my machine and the add-in folder has full access set to it.

Any ideas?