I'm sorry to have troubled you. I thought this would be a forum where noobs like me could come for answers to problems. I am well aware that Win7 is EOL and I was not looking for software developers to 'fix' anything.
When I asked a similar question about PrusaSlicer, I was informed that it was likely to do with my graphics chip and then offered a possible workaround, which, in fact, worked perfectly for me. I was simply hoping that there was a similar solution for Cura.
I am new to 3D printing, but not new to trying things and sometimes having to use alternate settings.
BTW, I am sure you will cringe to know that I still have 6 computers running XP in my household as well.