Adam: I'm back and have tried a number of things. Your answer works, but only partially. After loading msconfig, I unchecked "Pure Networks Platform Service." I received "An Access Denied error ... while attempting to change a service." It further said I may need to log on using an Administrator account to make the change.
I am the only person who uses this computer. Control Panel, User Accounts verifies I am the Administrator so I don't see why I get this message. In any event, I proceeded with the box unchecked and rebooted my computer.
On boot, the System Configuration Utility appears and asks me if I want to boot as Normal Startup or Selective Startup. If I boot Selective Startup, the Pure Networks message does not appear and the box remains unchecked in msconfig. If I boot Normal Startup [load all device drivers and services], the Pure Networks message appears and the box is checked in msconfig.
So I end up trading one message for another. Either I get the Pure Networks message or I get the System Configuration Utility depending on whether I select Normal Startup or Selective Startup.
Some way or other I have to get the System Configuration Utility to recognize I am the Administrator and make the unchecked Pure Networks the Normal Startup. Alternatively, I have to get the Pure Networks entry out of the list of Services in the System Configuration Utility.