There isn't a way to do this via command line. The net user command can only be used to add or delete users. This has been done for a reason, security reasons. You can use CTRL+ALT+DEL to change the password or Computer Management (compmgmt.msc).
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS