Just two things:
1- you may have said you disabled Norton, but I'd be surprised if that did anything. I can't tell you how strongly I recommend uninstalling that utter piece of crap software and trying what you're doing again. Even if it doesn't help, it will give me piece of mind that one less personal computer is running Norton.
2-
I can't imagine that in the short time they've been working on Windows 7 that it's going to be anything but suck part 2.
I'm sorry, but you'd be wrong.
Give it a try. It's essentially free to download and use for a year, and with that new virtualization software from Sun (I think it's Sun), you could try out Windows 7 completely free on your Mac. Give it a try or you will have no leg to stand on when you start your inevitable campaign against it.