What is this grey rectangle box on my laptop screen?


Aug 22, 2014
Well today on my screen is a grey rectangle box that appeared randomly when I turned on the computer I can move it around and everything but I can't right click it or anything.

I have scanned my computer for a virus but nothing came up. The only thing I can say is that it is a letter on there maybe a 'c' or 'o' but it seems cut off so can't see it all

Anyone know what it is and how to get rid of it?

I would include an image so you can see it better but I have no idea how to add it from a saved file.