HOW TO DISABLE RIGHT CLICK ON THE TASKBAR ??

You want to disable right click even on the window taskbar.

STEP 1: Open the regedit.exe.

STEP 2: Scroll down to or create the following registry key:

HKEY_LOCAL_MACHINE\Software\Microsoft\Window\CurrentVersion\Policies\Explorer

STEP 3: In the right pane create a new DWORD value named NoTrayContextMenu within the above registry key and set its data value 1 to disable right click context menu on the taskbar and to 0 to enable it.(Note:- You may want to complete delete the DWORD value NoTrayContextMenu when you want to enable right click.)