There are a couple of rules of thumb to remember regarding zoom settings. If you are opening an existing document that you previously viewed in Page Layout view, Word will use the zoom setting that you were using when last viewing the document. The reason for this is because zoom settings are saved with the document.
If you are opening an existing document that you have never viewed in Page Layout view before, Word uses the Zoom setting you were last using, the reason being that there was no last zoom setting for the document and so the last system setting was used.
You should note, however, that you should check the Zoom setting in your Normal.dot template file. This can also have an effect on newly created files. Open Normal.dot, set the Zoom setting for Page Layout view and then save the file again.
I think that should resolve your problem.
Thanks for the tips, Carol. I always enjoy reading your monthly Office tips newsletter.