I have 2 PCs running NIS 2010 which is about to expire, 1 PC running AVAST IS, and a WHS with no AV currently on it. I want AV protection that will cover all 4 of my machines. I had originally planned to switch all my machines to AVAST because NIS was such a resource hog, but after running AVAST for almost a year on the single machine, I've decided I'm probably better off sticking with Norton products. Does Norton have AV protection that I can use on my WHS and the 3 client PCs ? Has anything changed in the new 2011 versions that makes Norton less of a resource hog ? 1 of the PCs is old and when I have Norton running in the background, I might as well not even try to use IE.