In Windows Vista , you can create a password reset disc. Using which you can reset your admin password at any point of time.This is helpful , when you loose your password and you need the system access very badly !
To create a password recovery / reset disc,
– Navigate to Control Panel
– Open User accounts
– On the left side, Click on “create password reset disk” link
Make sure that you keep this pendrive , or disc safe with you. So, when you loose your password, Just enter some wrong passwords in the logon screen, then a link “reset password” appears . You just insert the disc and then reset the password !