How to update users' Trusted Locations settings on open?

Question

I am looking for a function that will trigger on opening of Access 2010 that will automatically update users' Trusted Locations to include the local network.  Only authenticated users have access to the drive, so there should be no security
issues in making it a trusted location for anyone who opens the application. 
It would be too time consuming to explain to 100+ how to add the network to their trusted locations, so I am looking for something to bypass this. 

Answer 1

I put the function into the AutoExec macro, but when the database is not in a trusted location yet, I get a macro error number 2001.  After pressing Stop All Macros, then pressing Enable All Content, the function runs and properly adds the location. 
Obviously the error occurs because the location is not trusted yet, so how do I get it to trust a macro beforehand?
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