4. AVG AntiVirus Free 2015 AntiVirus Free 2015 from AVG is one of the best free antivirus software tools available and is probably my personal favorite.
Simple One click installation! Effortless installation and starts working instantly. Quick No delays! Seamlessly auto updates and scans your computer in less than 2 minutes. Vigilant It checks your defenses! Customizable alerts warn you of potential threats.