That is more than likely a corrupt document, I have had that issue before.
Try transferring the document to a PC that has Word 2007 on it and open it there, see if it works.
If it does, then try reinstalling Word 2010.
The issue may be some "converting driver" type of thing since Word 2010 documents are saved as ".docx" where as Word 2007 saves documents as ".doc"
Is it a file you are trying to import into Word, if so what format is that file?