If I go to www.booker.co.uk it starts to open http://www.booker.co.uk/home.aspx, then hangs, saying it is downloading some .png file. I can't open any of the links on that page either. If I go to www.sainsbury.co.uk it readdresses itself to http://www.sainsburys.co.uk/sol/index.jsp and just hangs I have Norton Internet Security. There is no "blocked cookies" showing, and both sites are in the "Internet" zone, no blocked site indicator. I can open the sites on my phone so I am confident it isn't at their end. What should I look for?