Grisoft is in the business of selling antivirus software so you have to dig a little to find the free download for home use. AVG Free Edition is available to home users only. Use of AVG Free Edition within any commercial organization, school, church or charity is prohibited.
Their website describes the features:
Rapid virus database updates for the lifetime of the product
Easy of use
No system slow down
Automatic update functionality
A resident shield, which provides real-time protection as files are opened and programs are run
An e-mail scanner, which protects your e-mail
An on-demand scanner, which allows you to perform scheduled and manual tests
A virus vault for safe isolation and handling of infected files
The free version of AVG is widely used and there are no major complaints other than the size of the update files for those on dialup.
They provide nicely written online
reference guide for the product.
thanks to knowmate Therese Weel for this resource April06