Here's a cool trick I came across which allows you to Display a Notice/Custom Messege at System StartUp. Follow these easy Steps :

1.Click on Start > Run

2.Type “regedit” to open up the Registry Editor, now Navigate to

HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>policies>system

3.When you Click on System, at the right side you'll see

“legalnoticecaption”

“legalnoticetext”

4.Right click in them to add you own notice or custom message

“legalnoticecaption”=”Enter Your Notice/Messege Title”
“legalnoticetext”=”Enter your Notice/Messege”

 Thats it ! Save and Restart  !

From : TheVistaDaily

Thanks for the tip buddy.