Here's a clear summary based on your source and Windows community/engineer explanations:
Why You See a Blank or Unnamed Program Blocking Windows Shutdown
When you shut down your PC, Windows sends a message to all running programs and background services asking them to close safely.
Sometimes...
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I get an error message every time I shutdown the computer, it says something about netsh.exe not being able to do something that it needs to. The event viewer says that it is event 1002, dhcp-client. Also says "The IP address lease 198.18.64.___ for the Network Card with network address _____...