1. Kaspersy AntiVirus http://www.kaspersky.com/
2. Panda Antivirus http://www.pandasoftware.com/
Both are easy to deploy on networks. I tend to sway to Kaspersy though. It has a nice migration. The admin can set it t run in the background with custom paramiters on each machine that can't be tempered with by the user. But it still allows users to do manual scans. If they find anything or the background scanner does. It has a multitude of options to be notified. It will even lock out the offending program until you can get to it. As well it will notify you at home via personal email when away.
Norton is OK. I found MCaFee screwed things up a bit. Just my personal choices.