The account is only hidden in windows xp welcome screen, it is visible everywhere else.

Instructions:

  1. Click "Start" button
  2. Click "Run..."
  3. Type "Regedit" + press enter
  4. Navigate to " HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ WindowsNT \ CurrentVersion \ Winlogon \ SpecialAccounts \ UserList"
  5. Create or modify "Account to be hidden" (DWORD value)
    0 = Account hidden
    1 = Account visible
  6. Exit registry

Restart computer