Change The Message Shown On The Logon Box

To Change The Message Shown On The Logon Box follow this step:

Start/Run/Regedit

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\ CurrentVersion\Winlogon.

Value Name: LogonPrompt,
Data Type: REG_SZ (String Value). 

Create a new string value named 'LogonPrompt' and enter the text you want to display. The default message is: 'Enter a user name and password that is valid for this system.' This feature can be used in conjunction with the Legal Notice Dialog Box Before Logon tweak.