how to enable administrator account windows xp

Windows XP uses that idiot proof welcome screen where all one has to
do is click the stupid icon of a user and wham! He's logged on.
In every installation of Windows XP, there is a built-in and defaut
administrator user account named Administrator, which is equivalent to
super user or root in Unix system. However, if you have set up another
user account in Windows XP, the Administrator account will be hidden,
cloaked and invisible in User Accounts or Computer Management.
To see the Administrator account, you have to boot the Windows in Safe
Mode. However, you can modify the Windows's registry so that the
Administrator account will be shown at Windows XP's Welcome screen for
you to select, in the Control Panel's User Accounts and in the local
user lists in Computer Management.
1. Launch Registry Editor.
2. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
NT\CurrentVersion\Winlogon\SpecialAccounts\UserList in the Registry
Editor.
3. Double-click the Administrator key in the right pane.
4. If the Administrator key doesn't exist, right-click on the above
tree in the pane, choose New, DWORD Value, name it Administrator and
press .
5. Type 1 in the "Value data" box, and press .
Note: To launch User Accounts in Control Panel, you can go to Control
Panel -> User Accounts, or click Start -> Run, and then type Control
userpasswords and press Enter.
Once you unhide and reveal the Administrator account, you can change
its picture or assign it a password or change the password. In
addition, on the next boot to the Welcome screen, the Administrator
account will be visible, along with all of the computer's other user
accounts.