I downloaded a picture to my desktop and it was so big it went off all 4 corners of my screen. I can't see the top bar to close out the window nor the bottom right corner to shrink the window. How do I delete this from my desktop then?

Ok, that didn't work and only closed out this window in discussions. After it closed this one I tried again doing the same but nothing. Makes sense though because if it closed this one out it would close everything else out on my desktop too. This is like a giant screen saver. All my other .jpg icons are still on my desktop over the top of this big pic. Is it possible this is what it is, just a screensaver? I did the same with another pic from the same website and it didn't do this. I clicked on my mouse to save a pic to the desktop and this monstrous thing appeared. My dock is still there and the top bar that has the apple, Safari, edit, etc., but not anything else that you would normally click on to close a window.

Ok, I found out, it turned into a screen saver as I found out when checking preferences>screensaver, and there it was. Have no idea how it became one though.