Basicly you create a new key in the registry and tell where the trusted folder is.
a. Run the registry editor by doing Start->Run and typing in regedit
b. Navigate to the following folder:
HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Access\Security\Trusted Locations\
c. Highlight the 'Trusted Locations' folder, right click and do New->Key
d. You can name this whatever you like.
e. Then highlight the new key and right click and do New->String Value
f. Name the new String Value 'Path' (without the quotes)
g. Highlight the new 'Path' key entry, right click and do Modify
h. Here type in the path to your new trusted folder something like:
c:\mynewfolder\
Ok to save, close the registry editor and it should work.
Let me know how it goes or if you need screenshots...