Depending whether or not its free, i would recommend Norton internet Security, cos it comes with antivirus software, it updates it's database everyday unlike others that do it monthly.
Guys I have used many antivirus software packages around here and I think Avast! is the best free solution around. The automatic updates are great and really frequent. I must say I have never had a trojan/virus infestation. It stops malicious scripts from webpages etc. really well. Anyway, do any of you use this one as well?
Norton is not free. For me personally, I am happy with a free solution that does the same. I use Sygate for my firewall protection, avast as antivirus software and other free tools and believe they perform as well and mainly for FREE!