Dell installs all their servers with an annoying Dell background image (1.8MB!!!) on the main logon screen. This image slows down terminal service connections because you have to wait for this high color image to load. The first thing I do is remove this background from any new Dell server.  To do this, edit the registry key:

My Computer\HKEY_USERS\.DEFAULT\Control Panel\Desktop\Wallpaper

Just erase what is there.  You’ll be much happier.