Forgetten the password

Use winternal or what called the erd commander these bootable help u to change ur password.if ur are inside the erd windows click start the choose accessories /locksmith, locksmith allows u to the new administrator password to new one.then restart after typing the new password.then remove the bootable cd.then u can opne again the administrator.

Boot your machine with a USB or a bootable cd, and then go to c:\windows\system32\config folder and delete the file "SAM".