It's ok. We solved the problem by removing all the networking Protocol and Adapters on the new PC. Now NISerialRegistryMaintenance.exe runs, but very quickly so all we see is that the window pops up, then goes away. I take that to mean that it was timing out before. Which leads me to believe that the networking was set up differently between old and new PCs. Since we don't want any networking, we just got rid of it.
Thanks.
Margaret