CA AV Plus offers professional-grade anti-virus and anti-spyware protection to home and home office users. The comprehensive solution offers integrated virus and spyware combating capabilities, guarding your PC from worms, Trojans, and other malware that can slow down or even damage your PC. And you can set your security settings in a snap with its new intuitive interface.

Features

Easy to use

Fast Scanning Engine

Integration with Search Engines to Block Malware

Enhanced Protection Against Rootkits and Spyware

Read more about the  CA Anti-Virus Plus Anti-Spyware

You can get a free 6 months license of CA CA Anti-Virus Plus Anti-Spyware from here

First this it seems that you need to have a credit card and register for auto renewal (you may cancel it later). It says

Have your credit card handy to enroll in automatic renewal service and receive 6 months of CA Anti-Virus Plus FREE!

also the bottom section says

When your six months of CA Anti-Virus Plus is nearing an end, we’ll send you an email reminder. You can cancel, or if you would like to continue the service, just do nothing and it will be renewed automatically. We’ll bill your credit card at then current subscription renewal price (plus applicable tax). It’s that easy. Keep in mind, you have 60 days from the billing date to request a full refund.

So read it completely and then proceed