Administrator password

I have a computer that only has user rights, the administrator password was changed for the the local computer before I started at my company.  So I don't know it.  
I want to be able to get administration power back to the computer.

I can log in as the user, but I want to change admin password for the local computer.
How can I do it?
Can I use CMD prompt. Does someone have the sequence.
This is a Windows XP machine HP Compaq. Pentium 4.  
Who is Participating?
HellmarkLinux Systems AdministratorCommented:
I run into this a lot at work. I'd use ntpasswd to reset the admin password. You burn it to a CD, or prepare a USB key for this (note, if you do that, don't plan on using it for stuff other than resetting passwords), and just boot that machine with it. Really easy, and lets you reset the password in minutes.
Amit KhilnaneyCommented:
The common mistake which sometimes done on xp machine is

A seprate admin a/c is create by name of Admin and Administrator a/c is left out

AT login screen Press ctrl+Alt+del

usename: Administrator
Password: leave it blank

Then try to login.. Third party utilities of this kind may contain risks because there was a tool from SysInternals which was purchase by Microsoft which allowed to do reset password in such situations

That was a legit software with a purpose if you can get your hands on it from a friend.
I don't want to splash cold water on this discussion but you'd better check your company policy and with your network admin before you try any of these approaches. Elevation of priv is a termination offense in some companies. If you are the admin, then any of these approaches will work.
HellmarkLinux Systems AdministratorCommented:
Do you still have the problem?
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