I use AVG Free and it works better and is much less of a hassle than norton or mcafee or any of the ones you have to pay for. I used to have norton and I got trojans all the time. AVG quarnatines them before they access my computer. Google it.
Antivirus software Avira Free Antivirus 2015 is a product of the company Avira Operations GmbH security . The free antivirus products are very good firm .