I try searching the latest Free Avg anti virus version and found this link,
downloaded it and success install it at my computer . This new version is Avg 7.5.5 , and it will help  for your computer protection against computer viruses.

Features:

* Automatic update functionality
* The AVG Resident Shield, which provides real-time protection as files are opened and programs are run
* The AVG E-mail Scanner, which protects your e-mail
* The AVG On-Demand Scanner, which allows the user to perform scheduled and manual tests
* Free Virus Database Updates for the lifetime of the product
* AVG Virus Vault for safe handling of infected files
* Great customer satisfaction!
download here