Customize the Windows Logon and Security Dialog Title

Start/Run/Regedit
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\ CurrentVersion\Winlogon. Value Name: Welcome, Data Type: REG_SZ (String Value), Value Data: Text to display. Create a new String value, or modify the existing value, called 'Welcome' and edit the value according to the settings below. Exit your registry, you may need to restart or log out of Windows for the change to take effect.