Recent article in PC Magazine SA (June 2000) rates Norton AntiVirus 2000 as Editor's Choice (5 stars) followed closely by Panda Antivirus Platinum (5 stars) followed by McAfee VirusScan (public beta) (4 stars) followed by eSafe Protect Desktop (3 stars).
Suspect one reason for not running two virus checkers together is the possibility that they might detect each other's virus definition files and start getting all excited. So, good practise not to run both together. I also use Norton (albeit an older version than 2000) but religously use LiveUpdate every week to update the virus definition file (although still got caught by LoveBug which propagated to quickly for me to get an update before it reached me).
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Feline
(I Sit, I Watch, I Smile)