Selina,
Thanks for your help, and I think you've helped me allay my worries about the level of security I have. I did as you suggested - I went to Subscription & Services on Tesco, and following your instructions, saw (to my surprise) that I have the Router Wireless and F-Secure.
I am one of those pensioners who came late to computers and have never really understood the technical side of it. I seem to have a sort of "mind block" when folk start trying to explain to me via a help line how to sort out any computer problem that arises. I am fine at digging up info about my ancestors. That is fun compared to the technical side.
I find it hard to understand how Hackers, Scammers & Fraudsters can live with themselves when they know they are making people's lives a misery. A couple of years ago, I was taken in by one of them. It was one of THOSE phone calls ... "We have noticed your computer is running slow and we think you have a bug and would like to run a test."
The test took over an hour with me sitting there watching THEIR MOUSE ARROW moving here, there, and everywhere on the screen, then at the end of it they said I had thousands of faults, and they said they could fix it for £80. I fell for it!
They still phone me all the time, trying to do the same again. I changed my passwords when I realized it was a scam. I never listen to them now.
Thank you so much again for your help!