1) Download LogonStudios here:

for XP:- http://www.mediafire.com/?ihdrmw7iaz4hken

for Win 7:- http://www.mediafire.com/?cwviyef2d744fzn

2) Install LogonStudios.

3) Download the FBI logon file here:

http://www.mediafire.com/?qhh05xsn7322q26

if you want other screens..
http://www.wincustomize.com/explore/all/...bi#/page/1

optional:- 4) Open Run and type gpedit.msc and press enter

->This should open the Group Policy Editor, now navigate to the following location in the editor
Local Computer Policy -> Administrative Templates -> System -> Logon

-> Here in the right side of the pane you should see an option “Hide entry points for Fast User Switching”

-> Right click on this option and set it to Enabled.

Switch User button should now be disabled from the Windows logon screen.

That's pretty much it, enjoy !