This is the message displayed on the Classic Logon box, not the XP ?Welcome? logon screen
[Start] [Run] [Regedit]
Go to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\ CurrentVersion\Winlogon
Modify/Create String Value of Data type REG_SZ Named [LogonPrompt]
Value Data: [Enter the text of the message]
Exit Registry / Reboot
