Without wanting to place too fine a point on it, if you don't have the media, username or password, it is most unlikely that you have a valid license. Regardless, if you create a restore point, then do the repair, you can revert to the current setup if you subsequently find yourself unable to access the files. The errant message about hardware changes suggest there's something more serious going on with your system.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]