Prevent SEP 12.1 Clients from using "Disable Symantec Endpoint Protection"

I am trying to prevent clients from being able to right click the SEP shield in the taskbar and clicking "Disable Symantec Endpoint Protection". 

I have followed all the steps in http://www.symantec.com/business/support/index?page=content&id=TECH168990 and the users are still able to disable SEP by right clicking the shield in the taskbar. 

It did seem to grey out the users option to disable anything by double clicking the SEP shield and going into change settings within the app itself.

Thanks