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can you get into windows at all ?
these are tough if you cant get in and sometimes the best option is to try to use the revert to windows 7
if your login was a microsoft email address you can change it at www.live.com but usually you get these problems because it wasnt one and it tried to change it to one.
i can give you a phone call even remote in if you can get the windows running but these sometimes dont have a good solution.