How to REMOVE/DISABLE search results from charmbar search

Hello All..
I'm new in here.. but have used a lot of the solutions created by all of you.
But I could not find a solution for my problem.

Case:
I have a user account that I need to "lock down/restrict"
I'm using group policy for non administrators:
Controlpanel
Prohibit access to Control Panel and PC settings
Start Menu and Taskbar
Prevent users from customizing their start screen
Remove all program list from start menu
Remove balloon tips on start menu items
Turn off all balloon notification
System
Prevent access to registry editing tools
Ctrl+Alt+Del option
Remove task manager

This helps me a lot.. BUT If the user are using the charm bar search.. they can access My Computer or Documents or ....
How can I disable the search on the START Charmbar


I have used the article: http://www.eightforums.com/tutorials/4595-search-windows-8-a.html but just removed the all checkmarks in the first Tip.. that helps.. but it dose not solve it.

My goal is to have a empty field when I search for anything.. or even better.. to remove the search function.

I hope that somebody can help me with this.

Best regard

The Pilot

Hi again..
I forgot to mention, that the Windows Search service is disabled and not running..
That also helps.. but you still get results..
/The Pilot