Here is what we use at work
McAfee Active VirusScan SMB Edition 25 Users by: McAfee - Software
But at home I use
McAfee Total Protection : Download
I'm sure the features speak for themselves.
Norton is also good but we found that the above protection suited us better, we supply Norton AV OEM for £24.99. We recommend Norton and McAfee to all users but some users may disagree.