The thing that people need to also do when they remove that entry, make sure it is gone in the Registry, and that the System Restore points are cleared as if you are trying to remove a Malware infection. Also make sure the entry is gone in Task Manager.

This Nagware should not even be showing in task. It should only be kept in Windows/Microsoft Update or Windows store. Even Windows store is bad at its Nag's, when it comes to reminding users to update Metro apps.

Now that I think of it. How hard would it be for someone to write up a rule that if gwx is on the unit. That the Service is disabled, when Windows try's to turn it back on and reload the nag software.