I am delighted at the number of readers who tried to help with my problem described in my previous blog. As far as I can tell, my inability to get the keyboard to respond correctly was due to a conflict with my wireless keyboard and my older version of Word 2002. Happily, it has been resolved (for now at least) and I'm back to seeing the correct punctuation marks where they belong.
Thank you to all those who helped. I'm very appreciative.