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How can I find my product key on windows xp disk? - seriel key for mount and blade demo

Previously, a number of questions, I really appreciate the Council published, but I'm still not the position of the product key can be found on my computer, apparently a file in Notepad Seriel.
Any tips about how it would be great because they can not afford to just go and buy a new hard drive. My drive is not authorized, may not mean DSN in the relevant documents. Disc is not in the original box, etc.