Best security for your computer is Avast Free + Malwarebytes Anti Malware Premium + Malwarebytes Anti Exploit + Comodo Firewall + AdblockPlus for your browsers. Avast and Malwarebytes Anti Malware should be good enough to handle threats, Malwarebytes Anti Exploit will shield all your vulnerable applications for exploit, and Comodo Firewall is a top free firewall that is more superior than Windows firewall because it does give you more control for your applications and it have a sandbox feature that allow you to run risky applications on a virtual environment without affect your host machine. In addition with Adblock Plus, it able to block annoying ads,pop ups, and malicious sites.