What to do if you forget your Windows password
If you've forgotten your Windows password, you can reset your password by using a password reset disk or by using an administrator account. For more information, see Create a password reset disk or Reset 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.
You could try to boot from your win 7 disk and run startup and repair but I don't know if this would fix it.