As I said in my post in the Security Forum. I think this is a bit alarmist. This also isn't the first time a nasty has tried to take out security software. With an updated antivirus. You should in fact be protected from this worm. This would of course make the comment “Bagle variant ,can knock out Windows XP Firewall” invalid. It should also be noted that the XP windows firewall offers no outbound protection. Which is really something every firewall should offer. Their are better protection options out there. Information on why running the windows firewall isn't the best security can be found here. The original post in the security forum linked this story. Another viewpoint on Bagle – Bagle has less bite because of patches and education.