The problem is the MBR needs "clean" to be run as norton antivirus is still picking up the virus sig on the MBR, I have already done what you suggested, but NAV is still picking it up. I have used a W98 boot disk (or windows ME) boot disk and done FDISK /MBR, but when running the virus software its still picking up the virus sig.
However when trying to use Clean to clean the MBR and then fixmbr to rewrite a new one, it wont let me do this when under XP O/S since the main drive is in use, and if I try and reboot with recovery console, it wont let me clean the mbr as the command is not valid / wont work in recovery console.