How to get your computer to have an FBI login screen

1) Download LogonStudios 

http://www.stardock.com/products/logonstudio/downloads.asp

2) You can download the FBI file here
http://www.wincustomize.com/explore/logonstudio_xp/9606/

or
http://skins19.wincustomize.com/24/79/2479496/26/9859/preview-26-9859.jpg