I get an error message when opening one of my word documents

[user1990]

When i try to open one of my word documents I get an error message that
states the following:

the file cannot be opened because there are problems with the contents

When i click on the option that says details it tells me the following:

The name in the end tag of the element must match the element in the start
tag.

Location: Part:/word/document.xml, Line 2, Column 697477

I have tried to open and repair were it simply did nothing (came up with a
blank document).
Thank you for your help!

 

[user1990]

Some information that I didn't include in the post above:

I am using the Microsoft Office 2010 Beta.
The problem occurred after i copied and pasted one other document into this
document, saved and closed it and the next day when i wanted to continue
working on it it came up with that message