"What to do if you forget your Windows password"
http://windows.microsoft.com/is-IS/windows-vista/What-to-do-if-you-forget-your-Windows-password
"If you forget the administrator password and don't have a password reset disk or another administrator account, you won't be able to reset the password. If there are no other user accounts on the computer, you won't be able to log on to
Windows and will need to re-install Windows."
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Microsoft forbids any assistance being given in these Forums to help you bypass or "crack" lost or forgotten Passwords.
Here is the Microsoft Information outlining that Policy:
http://answers.microsoft.com/en-us/windows/forum/windows_7-security/keeping-passwords-secure-microsoft-policy-on/39f56ef0-5d68-41ad-9daa-6e6019c25d37
Cheers
