Check out Panda AV (Score 0)

I really like the 'admin secure' package, it's what I use in my small 40 seat shop. The central administration part is nice, fully supports AD and can install itself via group policy. It take updates to the admin server and pushes them out from there. It's install packages are great, has a POP3 proxy and can tie right into outlook. It has windows xp, windows server, exchange, lotus, and linux versions... All in all a great package.

It seems to be very easy on a machines resources, and is very unobtrusive (other than the cute little panda guy there even befor login, you hardly know it's running).

Check it out. http://www.pandasoftware.com/