I know one way to change the password of admin without knowing the original password. To begin, you must have an account with administrator privileges and you must be logged into an account with these privileges. Log in and go to your DOS command prompt. For getting the command prompt you have to click start menu and then run enter cmd and click ok. So if the admin user name is abhishek and you want the password to be kumar then you have to enter net user abhishek kumar and press enter. So simple, your password is changed !. If your username contains one or more spaces, you must put it in quotes. I am sharing a video from MSN that will throw more light on How to hack a windows password ?