this is old but useful trick, you can change any user password without knowing the original one :
just follow the steps given below
1) Log into computer, click on Start>Run> Type CMD
2)From the command prompt window,type in net users, this will show you every account made in the computer.
To change an account password:
1)Click Start> Run>Type CMD.
2)Type in net user then the name of the account whom password you want to change
i.e "John Adam" put the name in the quotes if it contains spaces
.
3)From here it would ask for new password, type carefilly because it would not show what you are typing, if you recieve a message that command succeeded then you have done... enjoy
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