... dont use any firewall products, just the Windows firewall properly configured. With SP2 those 3rd party wirefalls do nothing but suck the life out of your system and provide little or no upgrade in protection for the type of use a typical user does...
Allow me to stop you.
While WinxXp Sp2 firewall is sufficient against incoming threats it does NOTHING against outgoing programs.
You download a virus that operates on the net (a trojan, for example)? With a third party firewall, the firewall tells you: "Hey pal, there's this program that wants to communicate with the net, what should I do?"
The windows firewall simply gives a "go ahead" to everything that wants to connect. Great firewall indeed. A great help to virus developers worldwide, really.
How many less DOS attacks would we have if people took in their mind that the default windows firewalls are crap and pay a little more attention to what they do.

A better suggestion in this matter is to shut off all the firewalls if simflying off-line, and to use the windows firewall ONLY WHILE SIMFLYING ONLINE (because you're not going to download and install anything even remotely dangerous while simflying). BUT, when using your PC outside FS, shut off that half-assed default firewall and get yourself a GOOD one. The cheapest freeware firewall you can find around is worlds better than the inbuilt one under any security point of view.
It's a little more complex, but your security will be better for it.




