I have copied this from a site that I am reluctant to send you to directly, due to the amount of unwanted pop ups etc.
This explains how to do it manually.
In Explorer, browse to C:\Windows\System32 and find the file named "logonui.exe".
Rename "logonui.exe" to "logonui.exe.bak". This way if anything messes up...you have a backup.
Place your new login in C:\WINDOWS\SYSTEM32 and rename it to logonui.exe.
That's it! Now when you log off your new login screen will be there.
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