Which of these antivirus softwares are better Trend Micro PC-Cillin or Avast? And why?

For Independent Anti-virus research opinions see =

http://www.av-test.org

Requires free registration = Latest test results from Virus Bulletin :

Independent Anti-virus and Anti-spam Advice =

http://www.virusbtn.com/vb100/archives/p...

http://www.viruslist.com/en/index.html

http://wiki.castlecops.com/AntiVirus_Com...

http://www.av-comparatives.org

http://antivirus-software.6starreviews.c...

Review: Free Antivirus Software - about.com =

http://antivirus.about.com/od/antiviruss...

http://www.virus.gr/english/fullxml/defa...

[L=Consumersearch]http://www.consumers...

An important thing to keep in mind, regardless of which anti-virus, anti-malware, anti-spyware and firewall you use

( http://www.microsoft.com/athome/security... ) is to keep it UPDATED, just as it is important to make sure you have all windows critical and security updates +

http://update.microsoft.com/windowsupdat...

Note: The way I have mine set is to only notify me that updates are availiable, but to not download them automaticaly. Then I can check to be sure I get just the ones I want. I then click on "custom", and after the updates have been downloaded I look them over to see which ones I want, then disconnect from the net, disable firewall and anti-virus program, and then install the updates, and then re-enable the firewall and anti-virus programs before reconnecting to the net.