I can't connect to the internet on my mac for some reason. ItTo view this page you must log in to this area on www.google.co.uk80. Then it says i need to log in?? I have no clue what to do. Can anybody help??

I can't connect to the internet on my mac for some reason. It comes up with a message saying the following- to view this page you must log in to this area on www.google.co.uk80. Then it says i need to log in?? I have no clue what to do. Can anybody help?? Some people have tried to get me to delete some file but when I go to User- Library etc I am told to delete a google extension from searching the problem on Google. This doesnt work.