Group Policy
Windows XP will not change an administrator account to limited if it is the only administrator account on the system (other than the account named Administrator).
A windows administrator account is a type of user that you can have on your list, an admin has full control and rights to to anything on the computer where as a standard user does not.
You have to be an administrator to change you're (and other peoples) account types.
Windows XP comes with two types of user accounts; normal user and the administrator. Changing a limited user to an administrator needs the administrator account password and then selecting the option from the User Control Panel.
By default, there is no password set for the hidden administrator account on Windows XP. When setting up this account and enabling it, the user must create their own password.
Your account must be of administrators type, or you can use built-in Administrator account if does not have password. Or if it has one and you know it.
Because, when you use Windows for the very first time - you need to tell it which account will be the administrator account. It doesn't automatically assign the administrator account to the first user.
Usually there is a hidden administrator account on windows xp. Try logging with username Administrator without a password. If whoever installed you Windows was smart enough to put a password on it, or you are working with the administrator account then try calling a technician.
Some software, settings and files requires administrator rights to be accessed or edited.
This is the beauty of a file system called NTFS. NTFS is based on security, and is on any Windows computer from Windows 2000 to now. This makes things such as trying to change the administrator's password from a standard account not possible. NTFS additionally adds file protection - your files will not be viewed from a standard account if set to as an administrator. Your answer in short is no. There is no way to change the administrator password with a standard account.
You are asked for the password to the Administrator account.
You will have to log in with administrator account and change the privileges to admin for that required account.