The company I work for (global company) uses McAfee on all of our machines. I'm sure it's an "Enterprise" version, which is MUCH more complete and expensive.
I've been using Norton for the last 17 years, and I've NEVER had a virus (knock on wood, my head works well for that

).
One point, though, is that I'm VERY careful, as Redcap suggested...
Wise men talk because they have something to say; fools talk because they have to say something.
--Plato