microsoft.public.access

Hello, I am working with some add-ins and somehow have deleted the
USysRegInfo table. I was cleaning up some files and must have deleted
something because now my add-ins are gone and I can't re-install them because
this USys table is missing. I see in other posts to go the the "Office button
in the top left corner" to check on options but I don't see that button.
What screen should I be on to see the Office button? I did the a MS Access
Repair but that did not help.

Thanks,
Margaret