I have Norton set so that it only runs when I start it up. I've just found it screws up too many of my other programs. It's a constant PITA.

I have not had any problems with worms or viruses, even though I have an "always on" broadband connection. I do keep Windows patched and updated, and Zone Alarm running at all times. I don't use Outlook, never open executables attached to e-mail, and I run Norton, Ad-Aware, etc., regularly to make sure everything's okay. So far, so good. ZA seems to keep out any net-spreading worms.