Word displays the Publish as PDF or XPS dialog box. Word displays a single button at the right side of the dialog box. (Don't click Save look down further on the left side and make sure you actually click on the Save & Send option.) Word presents you with some more options. At the left side of the screen click Save & Send.If that doesn't work for some reason, you should try using an alternative method of creating your PDF file: Instead, it appears that the update takes care of modifying the drivers responsible for creating the PDF files, and this modification fixes the problem exhibited in Word.
Note that nothing in the article says anything about generating PDF files. For them, the problem was fixed when they updated Windows as described in this Knowledge Base article: Several readers suggested that this isn't a Word problem, but instead is a problem with some Windows drivers. When she chooses "save as PDF," she gets an error message: "Export failed due to unexpected error." When she goes to save a document, there are options concerning the format in which the document can be saved. She has a problem generating a PDF file from within Word. Louise has a system that has the Academic Professional version of Office 2010 installed.