A couple weeks ago I started getting these ads that appear whenever I open Internet explorer or Firefox. It is always in the bottom left of the screen and they cannot be closed out of. The most I can do is click "hide ad" and then you can only see a small amount of it, after a few mins though it will becomes full size again. I have tried malwarebytes to try and get rid of it but that did not work. It doesn't matter what webpages I'm on, the ad is always there and it is significantly slowing down my computer. How do I get rid of this? Please help!