I also faced the same issue. It's a proxy issue and which is generally faced after establishing a broadband connection. These admin installed settings generally block some specific sites and in severe cases leads to a speed drop and flooded pop ups. I researched a lot and finally found this solution. Please try this, and if the issue still remain unresolved comment in comment box under video, I'll definitely get it resolved.

https://www.youtube.com/watch?v=Ug7-VEVXDXo
Don't go on title of video, its a many in one solution guide.

Thanks
Happy