Thanks for the responses, fellas!
Unfortunately, my Nvidia is only a GTX 560, which in its day

was nearly the bees knees, but not now! Shadowplay is beyond my card.
I had a Movavi icon on the screen, but maybe I've had it for too long; it didn't run.
To cut a long story short, I've installed the free trial of Bandicam (silent movie).
Taken half a dozen recordings, but don't have editing tools yet.
Right now, I'm unsure whether BANDICUT only comes with the purchased version.
Again, thank you all for your help and comments.
PS Enjoy it, Nigel......and don't forget to post something for us to watch!