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This should work in Word 2010, and you can always insert a page number field directly using Alt-Shift-P. However, the problem is probably with a special file that Word uses, called the building blocks file. The problem can appear with Word 2007 or Word 2010. In each case, you need to find the file that's causing the problem and rename it, and then Word will recreate it. First, check whether the Building Blocks template is disabled in the Word Options dialog box and, if it is, make sure it is enabled. From the File menu, choose Options. Click on Add-Ins, and check the list of disabled items. If you see a reference to Building Blocks.dotx, enable it, then exit and restart Word, and see if this helps.

If this doesn't help, you'll need to work directly on the Building Blocks template. Shut down Word and look for one of the following files. If you're using Windows XP, look in

If you're using Windows Vista or Windows 7, look in

Rename the Building Blocks.dotx file as Blocks.old. You should see a second file in this location called Built-In Building Blocks.dotx. Right-click on this and, in the pop-up menu that appears, choose Properties, General. While in this tab, make sure the 'Hidden' option is not selected. Restart Word, and you should now find that you are able to insert page numbers.