Change the Password of the administrator from user mode

Hey I discovered a new idea. It was actually mistakenly discoverted when I was doing Netstat on DOS.You can change the password of any user from your account. Below is process to do this:
Open Run command from Start-->Run
Type Net user [username] *
DOS like window will pop up type your password there and you are done...
Note: remember that there is the star symbol after the username.. and avoid the brackets too... You will not see the input information while changing passwordIt works try it But do u have all the privileges of the computer. I mean not limited mode