I don't have Norton on my computer.  I don't use any anti-virus program, and haven't for years.  I don't use Outlook, don't open attachments I'm not expecting, use Firefox with NoScript and Flashblock, and use WinPatrol and a firewall.  Haven't gotten any viruses yet (knock on wood).

External binary morphs are already disabled.  I will try render in separate process.  Does un-checking "check for updates" really make a difference?

I really think the issue is those IBL lights.  I have no problem rendering with normal, old-school Poser lights.  Except they're blindingly bright in Poser 9.