I had AVG9 on everything here (2 laptops and 2 towers) and was quite happy until it allowed a virus off a facebook page onto two computers
Computer shop man managed to retrieve my degree essays for me
and recommended the Microsoft security essentials software (free download)
Elaine - when I got rid of the Norton that was preinstalled on my laptop , I had to remove it first then install the new software, as the Norton blocked the download of the new software