System administration

Clarifications

I can't explain how to... Strikes me as disabling some excellent functionality.

and you as an admin should know the immense benefit of right-clicking adn seeing convenient little windows.

What exactly are you trying to prevent the user(s) from doing?
It may be better to disable that singular function.
Gpedit will disable right-click but for too much, here is the process and results;
Disable right click for Desktop, Files, Folders and Windows Explorer

Start Group Policy Editor. (Start->Run->"gpedit.msc")
On the left, go to
User Configuration->Administrative Templates->Windows Components->Windows Explorer.
On the right, enable this option "Remove Windows Explorer's default context menu".

This will limit the right-click effect;
https://www.techrepublic.com.com/5208-6230-0.html?forumID=101&threadID=253345&messageID=2424127