Not free - but very good value and the best AV on the market imho - kaspersky labs. I picked up a 3 licence, 2 year KAV Internet Security Suite, with a copy of the installation CD for AU $170 - very good value imho.
AVG was OK, but had too many issues for my liking - updates would always get screwed up and you had to uninstall/reinstall every few months.
I haven't used AVAST, so can't say too much about it in all honesty.
You could always switch to a better (i.e. more reliable and secure) system like GNU/Linux. I always find it amazing that people want a reliable and secure system, but insist on using Windows. That said, XP SP 3 and Vista are much better efforts from Microsoft in both regards.
Dave
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