Pop A Banner Each Time Windows Starts at 1:40 AM

To pop a banner which can contain any message you want to display just before a user is going to log on.

Go to the key :- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WinLogon
Now create a new string Value in the right pane named 'LegalNoticeCaption' and enter the value that you want to see in the MenuBar.

Now create yet another new string value and name it:
'LegalNoticeText'.
Modify it and insert the message you want to display each time Windows boots.

It's '.reg' file would be:
REGEDIT4 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Winlogon] "LegalNoticeCaption"="Caption here."