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How do I find my authentication code for windows 7

Last response: in Windows 7
a b $ Windows 7
October 13, 2010 11:06:01 PM

Hello, I have a genuine upgrade from Vista to Windows 7 professional. Last week it suddenly came up with non genuine copy of windows 7. Microsoft help won't help me without the authentication key (and I have lost the email and can't remember who I bought the copy from as it was online over a year ago.
Is there somewhere on my machine that tells me the code? cheers
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