<< also anyone know why when bootin win2k (or any OS for that matter) on a laptop lilke the loading screen looks so ghetto ugly.. like u know the win2k startup white screen with the load bar, it looks really awful on laptops, squished and super low res and low color >>
At the time that screen displays the video drivers you use while in Windows have not been loaded yet.
To change the login wallpaper navigate to HKEY_USERS\.DEFAULT\Control Panel\Desktop in the registry, and edit the Wallpaper string. You have to either be logged in as Administrator or use the runas command. Otherwise you cannot edit this string.