Registry: Change the Message Shown on the Logon Box (Windows NT)

You can personalize (or legalize) the message displayed on the logon box above the user name and password.
Simply create a new string value named 'LogonPrompt' in the key below, and enter the text you want to display. The default message is: 'Enter a user name and password that is valid for this system.'

Key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
Value Name: LogonPrompt
Data Type: REG_SZ