Chris: I'll explain why you're reply of "nonsense" to Growltiger (Richard) strikes me as being very unwise. If you haven't been hanging out here, it's understandable that you wouldn't be aware of the number of people he has helped out over the years by generously giving LOTS of time to them and by sharing his immense computer expertise with them. Indeed, you may not be aware of the people like me, when asked what we want for Christmas, that respond that all we want is Richard for Christmas. To summarily dismiss what he has to say is foolhardy at the very best.
Mike, thanks for the compliments! I think you are a little bit too hard on him. He ignored that most of my post was simply asking questions and the anti-virus suggestion was just a suggestion. Some of the "free" ones given can cause other software problems.
He likes Sophos which is perfectly good software, but he can't know whether the sometimes flakey Nikon software doesn't object to it.