i am using avast 6 free version, i was satisfied with it but one day my friend has scanned his pen drive through my system updated avast shows nothing as threat. then he scanned it with another computer in cyber cafe having bitdefender 2011 which showed more than 30 threat i was shocked that avast couldn't catch it up. from then i lost confidence with avast i don't know why that happened. i want to have bitdefender 2012 for sure.