Last year I upgraded to NIS 2009. All seemed well until I shutdown the pc and rebooted. I got the BSOD and had to restore my system to the original factory image that was two years old, then two days of installing security updates and software.
I have no problems with NIS 2006 so If it ain't broke why fix it.
I have found Norton support imcompetent. All they want to do is upgrade you to NIS 2010. I had some configuration issues with a website and fixed the problem myself. They really never poked around checking my settings. Very disappointing,
Running XP SP2 home edition with all security updates.