I saw some persons who had changed the appearance of their windows Start
screen or Shut down screen. For example when shutting down, instead of
seeing the message of "Windows is now shutting down" I saw a "Good Night"
message with a beautiful picture.

I asked one of them about how he did this. He thought a little and then said
I used "Microsoft Multimedia". I don't know either he was right or he just
didn't want to tell me the truth, but I have never seen a software called
"Microsoft Multimedia".

Do you know how we can change the start and shut-down pictures?

Thank you
Javad