To the best of my knowledge, neither NSW2003 nor NSW2003 Pro come w/ Norton Internet Security (NIS) or Norton Personal Firewall (NPF), the two Symantec consumer firewall products. If you have one of those products installed, you can right click on the GREEN/BLUE GLOBE in your System Tray and select "DISABLE." That may not disable the product permanently though.
Since the issue you're trying to resolve is file sharing across your LAN, that's a fairly easy issue to fix. I'll give you NIS2003 instructions as I don't have NPF2003. Hopefully the steps are similar in NPF2003 (if that's what you have installed):
[*]Double click on the GREEN/BLUE GLOBE in your System Tray
[*]Click on "Personal Firewall" (in the middle column)
[*]Click on the yellow "Configure" button (in the bottom of the right column)
[*]Click the "Home Networking" TAB
[*]Click the "Wizard..." button and run the Home Networking Wizard