I've always had bad luck with Norton. I figured they improved their software over the years so I gave them another chance and installed their 360 beta program after I first installed Windows 7. I had so many headaches with it, I had to do a fresh install just to get Norton off my hard drive.
So far AVG Free has been working out great for me. I don't want to buy a year long subscription to any A-V just for the
6 month beta test of Windows 7.