How to disable Turn Off Option and ALT+F4 option :

 

 Follow This Instruction:

1. Click Start>Run
2. Type regedit
3. Navigate through HKEY_CURRENT_USER>Software>Microsoft>Windows>Policies>Explorer
4. Then on the right side, Right click on blank area, Create a new DWORD value with name NoClose.
5. After creating click on it and give Value Data 1.
6. Now Reboot your Computer.
   
   
   

Your Turn Off option is now disabled . To Enable it again, Go to that directory, and simply delete that created NoClose and Log Off Your User and Log in again. Your Turn off Again Working.