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Mmmm, then I must have been doing something weird here: I have been running several Windows computers here since 1995, without firewealls, without AV, and I never had a single problem. But then again, it's in fashion to say stuff like the line from the author above. I never had a single virus infection on my computers running Windows, my parents', my friends', my relatives' and so on.
You didn't say whether those machines are connected to the internet. It certainly sounds like they are not. If they are, then I would love to have your amazing luck!
After running linux exclusively for almost two years, I recently (back in July) decided to try Windows XP Pro. I finally had to go back to linux because of three things:
1. I prefer Gnomad2/libnjb to Dell's Windows-only jukebox program for my Dell DJ music player.
2. I prefer jpilot to Palm Desktop for my palm pilot.
I could live without the above two programs, if not for the third reason:
3. Even after installing AV, firewall, anti-spyware, and all windows updates including SP2 from a CDRW (downloaded and burned in linux), AND clearing up any security holes that remained before going online, I still eventually got infected. My firewall was permanently disabled by whatever I was infected with, and both antivirus programs I installed were unable to detect and clean any viruses/worms from my system.
Now I'm back in Slackware and am loving every minute of it. I'm running the programs I really like, and I don't have to worry about infections or security holes. I update regularly with swaret, and I keep an eye out for any new security risks that are found in the kernel and various user programs. Yes, that's right, linux also has security vulnerabilities from time to time. I just find it a more secure system overall than Windows.
To go back on topic, if it weren't for the choice of GNU/linux and other operating systems, I would have been stuck using Windows, which isn't such a bad thing (not counting viruses etc), except that it also would limit my choice of which programs I can use for various tasks (see above). Because of the freedom of choice that I enjoy, I may one day move to OS X, since it allows me the freedom to use most POSIX-compliant software in addition to Mac-only software. That is an expensive choice, as I will have to buy new hardware, but the important thing is that I am free to make that decision.