As I mentioned in reply #2, I access some of my e-mail through Microsoft Outlook to have it additionally scanned by avast (Outlook/Exchange provider) ; although I read most of my mail directly through AOL, I prefer the added security of having anything unexpected or potentially suspicious scanned by avast also.
I should note that I consider all e-card notifications suspicious; and I routinely ask the supposed senders if they have actually sent anything before I open that sort of e-mail, since it is a common route for Trojan infections and no anti-virus program (even avast) can stop everything, especially newly-emerging viruses, Trojans, etc.
I also use some other programs recommended by experienced avast users in these forums. If you browse the forums, you will find a wealth of information, not only about avast, but also about other security programs and software you may find helpful. The sticky topics at the top of each forum are especially informative.
Welcome to the forums! I am sure you will find avast a great improvement over Norton, as have many others, myself included.