Create Your Own Logon Message.

1 Click start-> run-> type regedit-> 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: Tech Guru,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!