How do you know that it is not loaded? Did you look in the Templates and Add-Ins dialog?

How do you know that it is in the Word Startup Folder?
(Most computers have several folders labelled "Startup" only one of which will be the Word Startup Folder.)

Earlier I asked you what it is that you want to fix. Do you care to answer that question?

Are you trying to do something like Letterhead AddIn(s) - Default New Document?