Create Your Own Logon Message

1 Click start 
click run
type regedit, 
then click ok!

2 In The registry editor, drill down to the following key:
hklm\software\Microsoft\Windows NT\Current version\Winlogon.

3 Right click LegalNoticeCaption, 
click modify, 
Type: THIS IS NEXT TRICK,and then click ok!

4 Right click legalNoticeText, 
click modify, and then Close your message!

5 Restart Your Computer.

6 The message will appear every time you logon!