system reinstalation - registration key problem

Hello,
I bought almost a year ago MT and now I need to reinstal my system (Win XP). I mean i need completely format C disk. Unfortunately i can’t find registry key anywhere in the Main Type ( there’s only information to who is registered to). I bought Main Type through www ( paying by card) and have only invoice ( i’ve deleted old emials). What can I do?
thank’s for any help!

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