Technical,
I use A2,Edwido,XCleaner and SwatIt as backups among 8 gigs of other security programs that I have accumulated over the years. AntiVir does not have any advantages as far as I can see. I have used Norton Anti virus Pro in which the common client core never installed properly on my machine and it was to processor intensive;not to mention the support also left something to be desired (India). Grisofts Anti Virus was OK but the server updates were bothersome meaning the server was a problem for them for awhile. AntiVir detected an old .ssmzip file in my backups. This was a setup program for System Security Monitor and the program monitors dll’s. The setup program inserts a root hook in the system processes and when I emailed the program file to AntiVir they decided to include it as a Trojan. I understand where they are coming from but disagree. I wanted a Anti virus program that was not to processor intensive,scans email,quick updater and has good virus detection. Avast was the leader in the free category on tests done in August so I thought I would give it a try. So far it has been a good experience.
Respectfully,
R.B.