Thanks for the continuing input.
I haven't tried different refresh rates, from what I remember at a glance 60 was the only one.
I'm hoping my graphics card isn't too old, the cost of the graphics card wouldn't be so bad, but I think then I'd find the rest of my PC is too slow
I've done some more googling this morning and found that this might be a software fault in the latest version of the NVIDIA drivers that I recently
downloaded: http://forums.nvidia.com/lofiversion/index.php?t42195.html
So I am going to try an older version when I get home, and perhaps the new beta version.
Roger.