For all those who are struggling with LogonStudio, follow these instructions and it should work perfectly.
1. If the file is zipped up, double click it to start WinZip.
2.hit "Extract", and in the next menu find C:\Program Files\WinCustomize\LogonStudio. Now click "Unzip".
3. Close WinZip, and go to the folder that you just unzipped to..(C:\Program Files\WinCustomize\LogonStudio
4. In that folder you should now see the .logonxp file that you downloaded. (It's usually a white rectangle with an X in the middle.)
5. Double click the .logonxp file. This should automatically open the LogonStudio program and your new logon screen will be in the list. Highlight it, (if it isn't already highlighted) and click apply.
6. If your new logon is NOT listed, hit "Refresh List" (which is immediately below the list) and hit "Apply".
7. If it still doesn't work after following these instructions, don't write to me!!
This method works perfectly for me, and I have tried to explain it as simply as possible. I hope it works for YOU too.
Good Luck!