Hi Zatlas1,
The second of those links says Word 2010 cannot save files in the:
Microsoft Word 6.0 Binary Documents and Templates
Microsoft Word 95 Binary Documents and Templates
If the document you're trying to save was created in one of those formats (or an even earlier one), that could be the cause of the problem. If that isn't the case (and I accept that docx is a valid Word 2010 format) and the problems persist, try the approaches suggested here:
http://support.microsoft.com/kb/921541
http://word.mvps.org/FAQs/AppErrors/...artingWord.htm and
http://lounge.windowssecrets.com/ind...owtopic=197827
for various series of troubleshooting steps that will help you track down (and hopefully solve) the problem.