Disable the Start Menu’s Shut Down Option
At times you may not want Windows to be easy to shut down. In those cases, you can disable the Start menu’s Shut Down option. (Note: It will still be visible – it just won’t work.) Open RegEdit and go to: HKEY_CURRENT_USER\Software\ Microsoft\Windows\CurrentVersion\Policies\Explorer. Right-click on the NoClose entry, select Modify and type 1 in the Value data box. If the key entry isn’t there, add it by right-clicking in the Contents pane and selecting New/String Value. Now give it a name and enter a value of 1. Exit RegEdit and reboot The Shut Down option should now be disabled.
To restore it, just change the value to 0. You can also just delete the entire entry, press Ctrl+Alt+Delete, highlight Explorer and click on the End Task button. Cancel any dialogs that open, and the Shut Down option should work again.