Confirmed: The custom Firewall policy file as well as the custom AV config file must be named Symantec's default namefor it to be applied. The firewall policy must be named Cpolicy.xml and the NAV file must be named Grc.dat. CHanging these files from their default names renders them useless.
Download the NONAV.EXE utility and run it as a preliminary job prior to installing your new NAV client.
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