AVG is an inadequate AV software. (Don't flame me, just telling from my experiences with a lot AV software)
F-Secure uses Kaspersky & BitDefender real-time scanning engine (yes 2 engines) so it's very secure, but resource hugging.
Kaspersky is one of the best, but also the one with biggest memory footprint (uses most RAM as compared to others)
Norton 360 has vastly improved as compared to previous Norton AV series. Footprint is much smaller, updates are more frequent and very reliable too, when compared to when it was Norton 2005/2006.
NOD32 from Eset is also the best, especially if you have little RAM to spare, best for gamers and graphic designers/video editors.

There has been flaming war between NOD32 and Kaspersky fanboys, but my humble advice is, use Kaspersky if you have a generous amount of RAM (say 2GB with good proc), else still with NOD32 (512~1GB RAM).

Just my 2 cents.

Not quite true. Imagine if AVG/Avast missed that 7% of that 174,770 virus. that's around 12,000+ of virus. Think about it, then tell me if it is still "not bad".
I'm not using KAV btw, hate the huge footprint. Slows down explorer's seek/load time. Eset supporter. (Infinite trial period you know what i mean)

This post has been edited by konpaku: Jun 15 2007, 03:18 PM

I get your point. But honestly speaking, how many of us actually paid for AV softwares (those that are not free, lah)? If you use pirated XP/Vista, then why bother using free AV when u can get paid-but-u-know-what-i-mean AV (which is better but also free) ? I'm not advocating piracy here, just my 2 cents.