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That should work, and that's a great idea to prompt yourself for the password, rather than have it displayed in the run box history.saxy_simon said:'net user' contains some of what you want. Type 'net user /help' for instructions.
in particular "net user $username $password /add" will do the job (if you put the password as * you'll be prompted or it, which is more secure, since the passwords not listed in your command history)
This adds a user, to turn them into an admin you need to add them to the administrators group. This is done by "net localgroup administrators $username /add"