NAV 2011 Firewall?

I've read that NAV 2011is not supposed to have a firewall.  But if I go to Windows Security under firewall, it says that
at least one of the firewalls installed on this computer is on".  If I disable the Windows firewall, then it says now under firewall that "Norton Antivirus is currently on".  If NAV2011 didn't have a firewall, shouldn't it show NO firewall when turning off the Windows firewall?

 

I'm running NAV2011 (upgraded from NAV2008) on three XP computers and all three indicate the same thing.  When I have the Windows firewall ON, am I running two firewalls, like it says?   Is this a bug, or some leftover from NAV2008 that didn't get removed during the uninstall? 

 

I am running XP Pro SP3.

 

Thanks