I don't use Word 2007 so I am unfamiliar with the ribbon menu options.
But have a look at the YouTube video below and just confirm that this is how you set the page numbering up;
I'm using MS Office 2007 (student version) with Windows 7 on a Dell desktop.
When I insert page numbering into a document, only the odd pages display a number. I can't find anything in the drop-down menu that gives me an option of odd, even, or both. (I want both, of course). Am I missing something obvious somewhere, or is the program really misbehaving? How do I fix it?