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It's hard to say if you exactly *need* more protection.
Basically I think everybody should run a decent firewall as it alerts you about apps wanting to connect something out there. Without a firewall you have no ideea about this. Since you don't mention anything about trojan-scanner I really would encourage you to get one.
When it comes to port 21 and 135 there is no reason to show them for the world, closed or not.
All major firewalls can give you this extra peace of mind. However, as mentioned above, you'll have to learn a bit, read some and maybe visit the support-site to get everything the way you want it.
NAV corp edition may not be the most appropiate for a s ingle workstation. You might consider to switch to the ordinary version. (In fact you also may consider to drop Norton alltogether but this latter is mainly a question of personal taste.)
Good luck!
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unicorn
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