After the nightmare of trying to purge McAfee from my computer (AVG now offers a free utility for doing that)
Both Norton and McAfee are nightmares to uninstall. However, both companies offer tools that will do it for you. I understand why, but I still think it's ridiculous that you have to download software to correctly uninstall other software. Anyway, in case anyone needs them, here are the links:
Norton - doesn't really matter which you click on, it works for most of them
McAfee - surprisingly, the McAfee tool (at least the one I keep on my thumb drive) is even better. You pretty much just double-click and it does its job.
I am currently running AVG 9.0.664 and have not found it to be slow, big, intrusive, or any of the other bad things that people here have said. Of course, you have to remember what my basis for comparison is!
Certainly it's better than Norton or McAfee. But I can see the direction they're going in, and it doesn't please me. Just look at all the stuff they're adding in
here. A lot of that stuff looks like "features" they started adding into those Norton 360 packages a few years ago that made people abandon it.
Then there's little things. For example, I don't know how it is with 9, but at some point Grisoft stopped letting you download the full installer. It would download a small package that would then go out and download the program. I could understand this if it meant you got the latest version with all the updates, but I've found that you don't. What you get instead is an installer that you can't put on a thumb drive and take to someone's computer. I need that.
When it comes down to it, I still recommend AVG over Norton or McAfee. I can't tell you how many times I've seen those programs actually
cause more problems than they prevent (slow machines, loss of internet, etc). But I'm going to try out the Microsoft application for a while. So far it appears to be even more lightweight than AVG.