Is this the display you get when WIN wants you to enter your pin?
@MisterE I think they've all got the newest update and the last one is waiting because I've got it set on manual updates.
@FireMonkey OK.
@FireMonkey This might help:
Show desktop, put cursor somewhere reasonable, right-click, bottom of menu is Personalize. Check these options.
@MisterE no, it's the desktop on 3/4 machines all of a sudden.