FBI loging screen as ur PC loging screen

1. Download logon studio
For windows vista and 7
http://download.cnet.com/LogonStudio/3000-2344_4-10328443.html?part=dl-80664

2. Install the desired version. After that your open it your screen will look like this

3. Download this fbi logon screen pack
 http://www.mediafire.com/?9b235xmvvf7cqmb
and load it in tothe logon studio
okk now when you go to logon screen you will see that FBI login screen but you will also see the switch user button if you have a single account user.
Her's the trick to remove it
Download this file
http://www.mediafire.com/?yti679sua4x64ns

Right click on the downloaded .reg file and click on Merge.
Click on Run, Yes, Yes, and OK when prompted.Restart your pc.
When done, you can delete the downloaded .reg file if you like.

 To again add that button use this file

http://www.mediafire.com/?ooa8cydvc8ckklf 

and follow the same steps...