How do I get rid of this screen?
You can generally get out of any program with the "Force Quit..." command in the Apple Menu. If that menu is not available because the app has taken over the screen, you can try
command-
option-
power button. If that doesn't work, just hold the power button button for a few seconds to manually shut down the machine. NOTE: Any unsaved work will be lost, in this case. Wait a few seconds after Shutdown is complete and try a 'cold' startup. Please let us know what happens then.
How do I get rid of this programme
You can usually simply move any app or an app's files to the Trash and then empty the Trash. I assume you downloaded Zoom to begin with. You can always re-download it.
PS. Can we change the thread title to something a little less dramatic?