Always put anything you receive from the internet into THIS directory, and then move it elsewhere if you really want to keep it. That way, you won't have stray documents all over the place. As you copy them, you can also rename them to a filename that makes more sense to you. Your PC needs that to stay the same so it knows what software it needs to use to display your picture. Your PC knows that JPG and GIF are photos and it'll open up a photo reading application so you can see it.
Photos are generally virus free.
It'll make the window less than full screen. Once it is, you can resize it at any corner to make that Window a bit smaller. Do the same thing to the other Window and then you can have them virtually side by side. The one in the front is the one you have control of. But you can click on what's showing in the Other window, and make THAT one, the window that's on top and active.