It had been a while since I came across this error, but I just did, and I had to dig deep to remember the very simple solution.
Sometimes when a document is passed between Word 2002 and Word 2003 and track changes are used, you get this weird "revision - data removed" error. And then you can't open the document in Word 2002. But you can this weird window when opening the document in Word 2003.
I don't know what the user does necessarily to cause this (because I have lots of users exchanging documents between Word 02 and Word 03 with track changes) - but when you see it, the simple fix is to select all and past the entire document into a new blank document. And then resave it. Whatever code that is causing the problem is eliminated.