It probably got hung up when the connection was dropped due to inactivity on the keyboard. You could remedy that by altering Power Options > Advanced in Control Panel, by altering the Network timeout to "Never".
Or you could alter your update settings to advise you when one is available and then you could download it and install when you are ready to do so.
Open SecurityCenter then click Updates > Settings.
I would uninstall the Microsoft Safety Scanner as it could interfere with your McAfee protection.
Peter, thanks so much for the detailed information and alternatives! It is very much appreciated! :-) All the best!
You're very welcome ;-)