MS word on Windows? That is quite an old version of Word (office suite). What error do you get when you try opening your file? You need to provide ALL details about your issue to avoid going through 20 questions for us to figure out what is going on..
Assuming that you are speaking about Word 2008 (for the Macintosh) and not Word 2007 (for Windows), here are a couple of Web pages that will help you troubleshoot the problem:
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