Win XP or Vista Admin pasword recovery from limited.?

Hi, i need to know how to get the password for the admin acount from a limited acount on windows XP or VISTA. I cant change, or remove it so this is kind of a delicate situation :P is there a way to do this in Regedit or DOS?Win XP or Vista Admin pasword recovery from limited.?
There is a way to change the admins password from command prompt.

First go to Start, Run, Type cmd.

When your in command prompt type, net user. It will show you the admins user name. Type net user (the admins user name here) *

It will ask you to type a new password. Type your new password but no stars, circles or letters will show up when you type, that's fine. Just make sure you type it correctly because you can't verify it.

If you can't get to command prompt try this. Go to notepad, type command.com. File, Save As... run.bat on your desktop.

Then open run.bat from your desktop.

That should change your password.

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