Fake pop-up warning?

Screenshot 2015-01-28 07.12.32.pngCan someone tell me what this is? It keeps popping up on my computer. When I open my Norton program, all

seems OK...no "threats detected" warnings. So I'm guessing this is a fake? If so, how do I get rid of it?

I ran the Norton Eraser and that did nothing.

Thanks,

Suzanne