Nod32 is my AV of choice, it was a refreshing change after the Norton AV bloatware I had previously been using.
A 64 bit version is available as well for those of you running XP Pro x64.
It is very easy to set up maximum protection for the new user,using Blackspears tutorial from the official Nod32 forum...
EAV 3.0 Tutorial - 15 Jan 2008 - Wilders Security Forums