A family of Microsoft word processing software products for creating web, email, and print documents.
It certainly sounds like an XML tag problem within the inner configuration files, typically word/document.xml. These can often be manually repaired with little to no loss of content.
If you would like someone to attempt a manual; repair on your document, you will need to upload a copy of your damaged DOCX to a public file area like SkyDrive, DropBox or Google Drive and post the location to the publicly shared file back here.
SkyDrive's current policy is to not allow downloads on corrupt DOCX files. Go figure.
Please try to upload a copy that has not already been subjected to repair attempts as previous attempts may have stripped content that was recoverable with a manual edit of the internal components configuration files.