Footer style problem

I have a large document that I have imported from an old version of MSWord. The import went fine, except that the footers are all messed up. There are evidently different footer styles (Convert1, Convert2, all the way up to Convert13) spread all through the document. What I want to do is have footers with page numbers, all the same style throughout the document. I can’t figure out what the Convert stuff is all about. Is there any way to clear this mess out? I tried selecting all the text and copying it to new file, but it brought the footer mess along with it.