We run an enterprise edition of a popular AV, I have to uninstall symantec and when I do I get a note, if you are concerned about internet safety unplug your network cable. Many AV programs do quite well but it is often people clicking on links or opening email attachments that are the biggest part of the problem. I have one old tablet that strains under any av, I use it for gps navigation mostly but no av. I go to sites I know and trust, though cnn has had a past sql injection attack that will virus you! Mcafee site advisor is a good tool to use, and microsofts free scan every now and then, but being smart is the most important, along with an antivirus, even free avg. Oh and in response to above, no one in my control is allowed to use ie except for special permissions I grant for websites that do not perform properly under firefox. Firefox is my applied internet access of choice. Also in acrobat disable java, as that has been an avenue of attack.