Administrator Password

To reset the password you will need to have another logon account with (local) administrative permission. Now, if your wanting to change the domain admin account, you need domain or enterprise priv's to do this. Given the question, I am going to work from the supposition you mean a local admin password. As long as you have a logon account with the required permissions, just run the MMC, add the local users and groups snap-in, find the administrator account under user, right click on it, and choose to reset the password.

However, I am willing to bet that you are asking because you do NOT have an account with the appropriate permissions.... Learn from this - ALWAYS create an account with admin privs - do NOT use the administrator account when trying to work! I often create 2 admin level accounts and disable "administrator" since any script kiddie knows that the admin account exists and so already has a username to crack.

Now - if your in this boat, you will need to have physical access to the box, as compared to remote password resets. Go online to
http://home.eunet.no/~pnordahl/ntpasswd/
and use the offline password reset tool. You will need to create a boot floppy, or 2 if your server uses SCSI or Raid.

Of course, there are those that would use this tool when they have no right or reason to be on a machine - which is one reason why my head spins when businesses think their servers are fine even when they are not in a locked, secure server room.

Luck.
Dr. Sys