Except for Kapersky...
I've been working professionally in IT for the last 15 years, and the big names suck the big kahuna. Norton is good at finding viruses, but tends to not be able to delete them.
Just a few months ago I decided to change from Norton to something else and following the installation instructions needed to uninstall Norton before installing the new software. Within mere minutes of the uninstall Norton released a previously quaranteened virus that wacked me big time. A real nasty one.
Norton? . . .NEVER AGAIN
Protoss