how to disable the menu key (context key)keyboard using excel Visual Basic

[insaint13]

i trying to protect my excel workbook so no one can copy or edit my work,i have successfully disable all main sources of copying my work such as,"right click" on the mouse is disabled and "save as" is also disabled. "ctrl+c" also disabled,but I've notice that when i click the menu key( context menu key) it seems all my hard work is gone,they can use the menu key to copy my work and changed the prepared by, to their names...please help me guys
check the link below for those who wants to see the "menu key"

http://ie.microsoft.com/testdrive/ieblog/2008/Dec/10_NewAccessibilityFeaturesinIE8_2.png

thank you

 

[insaint13]

i have also use this code :
private sub workbook_activate()
application.commandbars ("cell") .enabled = false
end sub

it works on single cell only but when i try to "select all" or "ctrl+a", context menu pops up again...please i really need your help guys...