Provided Free with my ISP, and updates almost daily as new threats appear.
Never had any problems. Top of the line protection. By the way. ENCRYPTION is the standard for all Virus protection. And it has been improved with the SECURE versions of HTML..."https://" instead of the old "http://". Banks and large corporations, like Insurance, and Even Medical facilities use it to protect their services.
They call it SSL Protection, or a Certificate.
http://info.ssl.com/article.aspx?id=10241
SSL (Secure Sockets Layer) is the standard security technology for establishing an encrypted link between a web server and a browser. This link ensures that all data passed between the web server and browsers remain private and integral.
What is SSL? - SSL.com
Just a little helpful info to save you some bucks.