There is an image on my desktop. I can't erase it or anything. I can only move it around. The image will go on top of things like Firefox (it's not hidden). The scans were negative. The image goes away when I restart the computer. But, it comes back. I scanned with AVG, MalwareBytes, and SUPERAntiSpyware. Here is a screenshot. I circled the image. What is this image? Thank you.