alienware welcome log in screen and shutdown screen background dissappeared

hello everyone,,been awhile since i been on the forum,,but i have a little dilema,,,i had a malware that came through firefox so i did a hard shutdown then started in safe mode to run malwarebytes and a quick scan with security essentials..when i restarted the alienware background that was there in the login and shutdown screen has dissappeared,,,i did a system restore and no go,,,how do i get those back as they were installed from the factory when i got the pc

i have 2010 aurora(yes it still runs like a charm)