Everytime I start Internet Explorer, it defaults to duba.com even though I tried resetting it my default web page many times. Avast does not detect this virus. How do I get rid of it? I using MS Vista operating system.
Most likely seems like a broswer toolbar, use Adwcleaner from this thread - http://forum.avast.com/index.php?topic=53253.0
Upload the log for Adwcleaner incase theres something more.