Create Your Personal Log on Message
To create a message for your windows log on try this trick.
1. Start >> Run type regedit and the click OK.
2. In the Registry Editor, find the following key:
"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon"
3. Double click on LegalNoticeCaption, type something like My Personal Log on Message and then click OK.
4 Double click LegalNoticeText, and then type your log on message.
5. Close the Registry editor and your new message will appear at every log on.
Note:
For Standalone networks or Work groups or Personal Computers the custom screen appears just before the Welcome screen.