When you install Windows XP, it creates a system administrator account(called, by some strange coincidence, Administrator),which will be visible on the login screen only till you
create a new user account,after which it is hidden from you. To add the Administrator back to the login screen, open the Registry Editor and go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\
Winlogon\SpecialAccounts\UserList.
Double-click on Administrator if it’s there and change the Value Data to 1. If you don’t see it, create it by right-clicking in the pane and selecting New > DWORD
Name it Administrator and then change the Value data to 1
1. The next time you star tyour system, you should see the Administrator in the logon screen as well.
