Use Regedt32.exe to edit:

HKEY_LOCAL_MACHINE\Software\Classes\Directory\Shell or
HKEY_CLASSES_ROOT\Directory\shell

Double Click Shell and delete any of these sub-keys like DOS Here and Find. Navigate to:

HKEY_LOCAL_MACHINE\Software\Classes\Folder\Shell or
HKEY_CLASSES_ROOT\Folder\shell

Double Click Shell and delete any of these sub-keys like root explore, open, explore, etc..