How downgrade Windows Vista to Windows XP but don't ' know admin password

I want to downgrade windows vista to xp, but he asks an admin password that I don't know. What can I do?

Keep passwords secure - Microsoft on passwords strategy
http://support.Microsoft.com/kb/189126

What to do if you forget your Windows password:
http://Windows.Microsoft.com/en-us/Windows-Vista/what-to-do-if-you-forget-your-Windows-password

Tags: Windows

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    You could look at this http://www.ubcd4win.com/howto.htm

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    * Original title: get the product key

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    @@@@@@@@@@@@@@@@@@@@@@@@@

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