If using Windows Live Workspace does not work, I found another nifty way to open the corrupted .docx document online and delete the table of contents. This is how it works:
Step one - Go to Zoho.com, select document management and open a free account
Step two - In Zoho writer, go to "file", then "import". Select the corrupted .docx document from the location in your computer and click "ok". The import/upload process begins.
Step three - After successful import, the document should open and all you need to do is to locate the table of contents and delete it
Step four - Go to "file" then click on "export" and select ".docx". Select the location you would like to save your file on your computer and download begins.
Step five - Open the file in Word and you should not get the error "The File Cannot be Opened because there are Problems with the Contents - Unspecified Error" again.
Leave a comment if this fix works for you. If none of these fixes work for you, you can always try Free Word Recovery Software.
How to Recover a Lost Word Document