Antivirus from Your Internet Service Provider
Check with your ISP to find out if you are eligible for a free antivirus subscription. It's in their best interest to keep their networks safe, so most ISPs include a full AV subscription. If you are already paying for the service, it's wise to take advantage of these offers.
Comcast & Xfinity provide a full version of Norton Security Suite
AT&T's Internet Security Suite is powered by McAfee
Charter Security Suite is available for Windows & Mac. So fancy.