Google CONTEXT MENU EDITOR to find the usual titles.
http://www.thewindowsclub.com/remove-click-context-menu-items-editors is the first hit here and I admit I've used most of those there.
Contest Handler somehow becamwe corrupted. It now has cmd, Search and Open as Notebook in OneNote as the first three items. so, right clicking on a folder does nothing but give an error message. How do I remove these items?