Tried and true, AVG has one of the most widely used free products in the marketplace, offering protection against viruses and spyware.

In fact, AVG, which now claims more than 110 million users, has done the lions' share of its marketing via is free anti-virus product in order to develop brand awareness and foster a loyal user base. The latest version of its free anti-virus product has additional features such as AVG Social Networking Protection, AVG Protective Cloud Technology and AVG Smart Scanning.

The product is compatible with just about any Windows platform, including Windows 7, and is fast and easy to install. Plus subscribers have access to the company's free technical supports and the latest updates.