A built in dos command "Net user" to change any desired user account password in just seconds.
You will need access to command prompt window in this method :-
1- Open command prompt as administrator and following command
2- It will list all available user account in windows.
3- Then type NET USER_NAME NEW_PASSWORD
Replace NET USER_NAME with the user account name you want to change the password
Replace NEW_PASSWORD with the new password
For Example:- NET USER VIBHANSHU 123445
4- Now you are done type EXIT command and enter