I am having the same problem. Also, I cannot open URL attachments on OUTLOOK. I tried Microsoft but ran into a brick wall. As a result, I too have added Firefox and that works very well so I may go ahead next and try a trial version of Ubuntu, an open architecture system that is apparently much less tantalizing to intruders.
My supposition is that in its zeal to protect itself Microsoft has created an unworkable monster filled with dead ends and blind alleys that is too big nd too complex to respond to each of us little guys' questions.
Good luck, I have used them for 16 years and now this. They just can't be accessed and I need access. They are so shut off that even their security downloads are failing. Maybe they are done, for me at least. If they were accessible it could probably be repaired but I have apent hours with no response.