I have now openned a support issue at Vue Tech support.  Below are more details of this problem:

Hello, I have an extra PC running Windows 7 Enterprise 64bit. I have installed the rendercow software on the extra pc and it is running. I have added it to the HyperVue Network Manager running on my main PC which has Windows 7 Ultimate 64bit. When I added the rendercow PC, I used its IP Addess instead of name.  The port number has been set to the same on both the rendercow pc and the main pc.  After adding it the Hypervue Network Manager shows the extra PC with a RenderCow Status of "Idle".  When I go through the Animation render options window I select render which changes the status in the HyperVue Network Rendering Manager to "Sending scene...".  Also, the Batch Rendering window pops up and shows a JOb Type of "Network" and a Status of "Rendering 0.00%".  The extra PC that is supposed to do the rendering shows a rendercow window of "Receiving".  This is as far as everything gets.  Nothing else happens.  What else do I need to do?  I have truned off the fire wall on the extra PC. And I have given full trust to the extra PC on the main PC using Norton Security.