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Hi RB,
As long as your router is set up as DHCP server and gives you a local address (usually in range 192.168.x.y) then this is the only firewall you need. This is because anyone outside your network just cant see your machine. They can attack your router via its external IP maybe but generally this is fruitless.
You still need anti virus as you can still download bad stuff or click on a bad email and so on.
If however you need to set up services and use ip forwarding to allow connections from the outside world then you would generally turn the firewall facility on the router on.
This does not include the usual ports (80, 443) which are always open and forwarded to your local ip as otherwise you could not browse the internet.
Regards Paul
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