You could have AVG free or Avast, AVG antispy, Kerio firewall or ZA and Spybot or Adaware as 'reserves' for free. They work well, do not conflict and cost nothing..moreover they will provide you with all the protection that you could ever need.
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.