Is the Netgear firewall robust enough ?
Based upon Netgear web site spec :-
"The built-in True Firewall features Stateful Packet Inspection (SPI) and Denial of Service (DOS), which operate as your first line of attack against intruders. The DG834GT provides both WEP and WPA-PSK wireless encryption standards to protect your network from eavesdroppers and bandwidth pinchers! Content filtering lets you control access to inappropriate web sites and limit usage by time of day. To be ultimately secure you can limit access to designated computers using their unique ID, called a MAC address. "
I would say YES !
To adjust Norton 2007 Firewall settings try 'Internet Worm protection' under the Virus and Spyware Protection Options page.