I have a Word 2007 document that only show 13 pages but actually the file consist of 200 pages. Please help!

Using Word 2007, once I open the document, print layout only show 13 pages, the rest of the pages are like disappears and I am not able to scroll down to the end of the document. In other hand, when I go Web Layout, I am able to see all my contents in the whole document. I have reinstalled Office 2007, delete normal.dot file, try saving the file to RTF / HTML format, then save it back to DOC / DOCX format, but al this method does not help at all...