The following are free-for-home-use versions of commercial antivirus that are ICSA certifed among other certifications:
AVG
AntiVir
Avast!
My main issue with AntiVir and Avast! is that you have to manually update your signatures rather than have them be automaticlly updated in the background. I can't remember if it's the same for AVG.
Well, that brings up a follow-up question, I never used the automated update (a pain on dial-up), so for Norton, I would d/l an 8M file on a high-speed connection, copy to a zip drive, and update at home.
Avast and AntiVir seems like they might work the same way, but the files are only 2M or so.
AVG has incremental updates with file names as follows - the main file I downloaded today ends in 392. There are also priority updates labelled 392 and 399 on their support site.
Questions: If I were to go the the site now, how do I know there wasn't a 396 that I don't have. If I come back in a couple weeks and they are up to 415, how do I know whether I have 16 updates to install, or only one, or five, etc.
Thanks!