I have found that all the major AntiVirus programs Norton/McAfee/Avast/AVG all preform about the same. The only real difference I have found is in the amount of resources they use and that is directly related to the features each contain. An no antivirus is 100% effective 100% of the time. If there is a new virus out there with no definition then it will infect you no matter what antivirus you are running.

CyberStalker
just an example 2 week ago a friend was having a problem with his computer and ask if I could take a look at it. He was running McAfee and was updated automatically all was current. Some time in the last month or so he got a virus that did not have a definition the virus disabled McAfee ability to detect virus and you couldn't even tell it was disabled it looked normal and was running. By the time I finished cleaning his computer I removed 350 virus and Trojan infected files and 200 mall ware programs.

This can happen to any antivirus program they can not stop what they cant see.

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A little common sense goes a long way

Later Grandpa