>>To view all of the user accounts:
1) While logged onto the computer, click on Start>Run>and type CMD.
2) From the command prompt window, type in cmd "net users".
This will show you every account that is made onto the computer whether it is hidden or not.
To change an account password:
1) While logged into the computer to an account that has administrative rights, click on Start>Run>and type CMD.
2) Type in "net user" then the name of the account then * and press enter. here is an example: net user administrator * or net user "Jay Prakash" * . Put the name in quotes if it contains spaces.
3) From there it should ask for a new password. Type in your new password (type very carefully - the command window won't display what you type) and once more to confirm it. If you get the message that the command succeeded successfully you're all set!!