New
#1
Did you accidentally install DropBox ?
Your screenshot shows its desktop shortcut.
In case you don't know what is DropBox. It's very much like Windows 10's own OneDrive.
https://www.dropbox.com/
Could it be they are actually part of the image you have set as your desktop background?
That must be what they are, part of the desktop wallpaper! LOL This is an old trick. I took a screen shot of a friend's computer, hid the taskbar, moved it to the top so it wouldn't accidentally open, hid all the icons, and used the jpeg as his wallpaper! That kept him busy for a while!