I have a screen shot I've just taken and inserted in my document (Word 2010). I'd like to highlight part of that picture by drawing a red circle around it. I right-click the picture and would like to select Edit Picture to perhaps launch MS Paint but the option is greyed out.

Is there a way to easily do what I'm trying to do? So far all I've figured out is to save the screen-shot as a document, edit it directly in Paint and then reimport it.