Yep, that'll do it! As soon as you mentioned the host file I got a memory twinge to say I knew about it. A quick search in my 'How to set up Poser'  file I created when I had the same issue when installing my laptop and there it was, at the end of the setup process just after how to get rid of the red outline on the selected item. 

Thanks for the info anyway. I'm all up and running!