In Office 2003, you would go to disabled Add-ins, under Help, About.
Perhaps the same for 2007?

bestzin wrote:
> I successfully installed the Acrobat PDFMaker add-in when I installed Office
> 2007 several months ago. The add-in is now now longer available and when I
> attempt to reinstall it, I get the message "The corrected state of Add-Ins in
> the registry cannot be changed"
>
> Ideas?
>
> Gary N