McAfee AntiVirus Plus free 6 months

McAfee AntiVirus Plus protects your PC against any type of viruses, hackers, spyware and more.  The perfect mix of performance, accuracy, and reinforcing protections keeps criminals away from your PC and data. NEW Unobtrusive, High Speed Scanning Engine - From startup to on-access scans, get high performance to minimize scan times and extend battery life. It also have NEW Vulnerability Scanner , Real-time Antimalware , Two-Way Firewall , NEW Malicious Ad Protection, ENHANCED Digital Data Shredder, IMPROVED Safe Socializing, Searching, and Shopping , BETTER Anti-bot Protection, PC tuneup, NEW Home Screen which enables you to navigate easily through common tasks with a redesigned home screen that supports touch-friendly device.

McAfee AntiVirus Plus key features :
Real-time Antimalware Protection
Block threats like viruses, Trojans, and spyware in your files, email, and web downloads
Adaptive Two-Way Firewall
Prevent software from exploiting your OS or stealing your information
High speed scanning engine
Get high performance PC scanning that minimizes scan times and extends battery life.
Malicious Ad Protection
Block malicious ads and hidden iFrame code from infecting your PC
PC Tune-up
Remove unused junk, cached browser files, and other unnecessary files to speed up your PC
Vulnerability Scanner
Detects and fix vulnerabilities in Windows and your favorite browsers and applications to frustrate hackers and prevent infections

McAfee AntiVirus Plus free for 6 months :
McAfee AntiVirus Plus costs $27.99 for 1 year but as part of promotion from Mcafee you can download and use it free for 6 months. Download it free from here.