The change for the Triggers service to run under the Network Service account will not take effect as long as the "Allow service ...

The change for the Triggers service to run under the Network Service account will not take effect as long as the "Allow service to interact with desktop" check box is selected.  To allow this change to take effect, clear the "Allow service to interact with desktop" check box on the Log On page of the Properties dialog box for Message Queuing Triggers in Computer Management and restart the service.