You've got a tracker installed in your system. And it's pointing to an irrelevant location.
Basically, something is trying to track where you go by having your Web browser attempt to download a 1pixel by 1pixel image (a black or white dot, basically). If that "something" no longer subscribes to adforge, the image gets removed, but the lookup continues happening. The sucker sort of "gets stuck" trying to find that 1x1 image.
The easiest answer, though it takes a little while, is to download the
Malwarebytes software and run it.
Make sure you know all your Web site passwords. Malwarebytes generally does not affect sites that are supposed to remember you, but it's happened to me a time or two. Usually with certain sites that tried this same thing.
When you run Malwarebytes for this particular issue, I think their basic scan should catch it and remove it.
The other option, is to go to your browser settings and delete all those temporary files that browsers create. It's best if you check all the options there, but that means that all sites that automatically remember you will now no longer remember you, and you'll have to login again.
