I "took off" about 5 years with Symantic products. (I spent too much time fixing them for friends, etc...)
Then I got a Laptop with NIS2008, and after I got it running, I actually liked it (them) again. (It conflicted with other crapware that came with it from HP.) I liked it so much I added it to a total of three machines. Currently running 2009NIS on XP and Vista. WITH CPUs as low as Single core 1.7G-AMD. They are VERY responsive to problems and will upgrade you (free, same time-out of your existing subs.), at the drop of a hat, if that helps solve the problem. Rick Glazier From: "Tim Lider"
As of the 2009 product NAV and NIS are very good at what they do with a smaller memory and process footprint. I have seen many reviews from Maximum PC and even Tom's hardware that NAV 2009 was the Antivirus in December 2009. Not sure how it is now. BTW, I am using NIS 2009 and have no issues. Although, a little problem with Windows 7 integration and the Firefox Add-on. I just wish NAV would make it so you can get more detailed info than what they show.