To pop a banner which can contain any msg you want 2 display just b4 a user is goin to log on.
Go to run and type regedit and press enter.
Then go to key
HKEY_LOCAL_MACHINE>software>Microsoft>windows>current version>winlogon
Now create a new string value in the right pane named "LegalNoticeCaption" and enter the value that u want ti see in menubar.
Now create another new string value in the right pane named "LegalNoticeText".
Modify it and insert the msg you want 2 display each time windows boots.
Its".reg"file would b:
Name==REGEDIT4
code=="[HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrent VersionWinlogon]"legalNoticeCaption"="Captionhere."