NIS 2011 Upgrade and Run LiveUpdate patch failure. Posible Trojan.

Hi, I recently upgraded some of my computers to NIS 2011 and I had no problems with the installation.  But when I ran the LiveUpdate, there was a failure to install one of the patches.  It was attempting to install like 22 patches and one of them called Web Anti-Phising update failed to install.  I thought this was temporary and did a reboot.  After the reboot, I tried to run LiveUpdate again and it failed.  I did not notice anything unusual with the computers and I just ignored the error.  I ran a full scan and NIS did not detect anything.

 

I have a SonicWall firewall installed on my network.  I recently checked my emails and the SonicWall informed me today (when I was upgrading the computers with the latest NIS) that it blocked several attempts from a Trojan called Phish_PayPal.  I'm wondering if this is what's causing the patch to fail during install.  Any suggestions on how to tackle this issue?

 

I'm wondering if the Norton installation files were infected.  I had no problems until this morning (Nov 28, 2010).  The only other thing that I installed was an upgrade for a Dell Support program. 

 

Thanks in advance.