The problem could be with an owner file (sometimes called a "lock" file) left over from the crash. Such a file is created when you edit a Word document, and it has a similar name as the document but the file name starts with ~$. Display hidden files in Windows and delete the file. You must exit Word first, and possibly also restart Windows. For more, see
http://www.gmayor.com/what_to_do_when_word_crashes.htm.