I have a Linksys wireless modem router installed which connects wirelessly with my desktop. My router is 'SPI Firewall Protection' enabled. Do I still need Zonealarm firewall in my PC?

If you have WEP on your Wireless connection then IMHO would say Norton Internet Security and Zone Alarm are both superflouis. I have many clients using just Windows Firewall...

I say YES it or another is. ZA and others protect not only ports but applications. I would never run a computer on the internet without a very complex scheme to protect the OS. I would never expose a system with personal data to the internet either unless I was darn sure it was rock hard solid secure. I read it wrong and answer it wrong too. So get off my case you goober.

Look, if a hacker wants to get on your pc and is willing to expend the time and energy to do so, the hacker will get on your pc. As far as your exposure on the internet when connected your SPI Firewall should be plenty. Understand that a firewall doesn't protect you from spyware/malware/virus's. One advantage of ZA or a software firewall is that it can notify you of OUTGOING application requests. This can give you a clue that you may need to look at your pc a little closer. Personally I have been behind a Netgear firewall for 4 years running no AV or ZA and haven't had a single issue. I do run spyware/malware scanners and know how to practice safe computing. My kids computer on the other had is a different story. I have it loaded and scheduled [since I know they won't take the time]. Knowing the correct answer and giving a correct answer, are two different things

Roentgen, As you are already using wireless router it already has got in built firewall. The only issue is to configure that according your needs. On top of this your computer will also be having windows firewall running in it by default. Now the only thing to consider is the speed of your internet connection. If you want your internet to be super fast then it is better to stay away from ZA. Especially, Norton Internet Security is a headache in terms of speed. Computers using Norton are super slow compared to others. Networkid "Try more achieve more"

Thanks a lot people!