I wouldn't bother paying any money for virus protection. If you really want separate virus protection, rather than simply using the built in protection then there's a range of free choices, for example AVG AntiVirus Free (2016), Panda Free Antivirus (2016), Bitdefender Antivirus Free Edition (2014), Avast Free Antivirus 2015, and Check Point ZoneAlarm Free Antivirus + Firewall 2016.
I lost count of the amount of Norton CD's I threw away at an old job, they came free with the PC's but there was no way we were going to install it.