Hello Folks, Here is some professional advice for Antivirus programs. (19 years experience).
Norton = i don't have enough thumbs to point down for home versions, Commercial version awesome,
McAfee NO Way, you couldn't pay me enough to use it
Avast NOOOOOOOO
For years i used Avira, until few yrs ago they got onboard with ask.com an there tool bars, (toolbars are a total waste, stay away from all of them)
AVG use to be at bottom of list, then in 2014 they went right up to the top (free version). It was tried/tested in PC Labs. scored 97% good. #1.
One of the worst pc's i had to fix had norton, 2650 trojans. an that is an exact number.Was a windows 8 laptop.