My wife got a new IMac for Christmas this year 2014 . Today she opened a window and there was an add at the top of the page. The add will NOT go away. Each new window she opens it comes up within 2-3 minutes after opening the window. The add is Cinemas by Cinemas . It is always at the top of the page and we cannot even find a spot to close the add. We have even tried rebooting.