Locked Pc screen displays diff pic

[Matt]

This is probably a very simple one but i cannot seem to
change the picture just as the machine boots and also is
displayed during the locked pc screen.

I have tried to change the desktop background but this
doesn't change the other pic.

Any help will be much appreciated

Matt

 

[Bob I]

Turn OFF Active Desktop and then you will be able to play with the
"real" desktop.