A package from my ISP (anti-virus,
firewall, anti-spyware, popup/ad-blocker etc), which despite being free, works very well for me - as
Cressida said, coupled with a good dose of common-sense.
On my mum's PC...Kaspersky Anti-Virus 6.0, and ZoneAlarm Free. Again, works well.
Edit: Hehe, passed all the firewall tests in
Dean's link above. Not bad.
