Thanks for the suggestions.
None of these solutions worked with the twenty twelve theme. I was beginning to go mad because multiple posters advocated solutions which did not provide a disallow option to click or unclick using screen options, discussion or any other solution path advanced to me.
I was on the verge of changing themes when I tried an innocuous button on the bottom left of the screen under page attributes when in edit mode. I clicked it and it gave me the option of 1) default template, 2) front page template and 3) full width template no side bar.
I selected front page and the comments at the bottom of that page disappeared. I repeated it for every page but my actual blog page and all comment bars at the bottom of each page updated disappeared.
Thanks for everyone's input. I am adding all this so that if someone else chooses twenty twelve theme they wont have to figure this out all over again or question why they cant seem to follow simple instructions that seem to have been working for everyone else.
All the best and thanks again.