Start - run - type gpedit.msc there are hundereds of setting in there, under start menu and taskbar settings there is a setting called dissable drag and drop context this should stop them messing with the start menu.
I'm sure there is a right click policy in there to but i cant see it at the mo.
If that fails then alter the local permissions on the start menu folder and take away their admin rights, that should prevent them messing.
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