Much clearer now!

First, if you have bought the certificate, it was to do not have this
message box asking whether to enable or disable the macros. It's purpose
that it certify that the code inside is safe and can be trusted.

So all the users who would use the document should open the document whitout
having to answer any question, unless you haven't set your certificate
correctly.

But now if your client wants to separate users that have clicked on yes from
those who have clicked on no, you can do nothing (you cannot run a code that
will disable the opening of the document and nothing else because the user
doesn't allow you to run any code!! logic).

so for that you must use a trick and you have three solutions:

1. is to create a document that will open the file that you are interest in.
   just write in the the Open Event of your Document
       Application.Documents.Open ""    'Your document full path
       ThisDocument.Close False            'Close the document

because this document has some code in it, it will ask the question :"Enable
or disable macros"....
if the user accepts, it will do what you want, if not, he will see only a
blank document (that you can set to ReadOnly to he cannot modify it)
that's a solution, a bit weird, but works..

2. the best solution is to everything by code!
in your document that must run without having MSWord asking to enable or
disable your code, because now you have a trusted certificate.
at the opening of the document, You will ask with a message box your client
question
if the user answers yes, you will do something, if not, you'll do something
else.

the advantage of this solution is that it allows you to run your code in any
case.

3. Set a password to your document like the company name so all the users
can remember it...