turingtest2: Thanks, but I have been down that road many times already with no fix.
I spent several hours on the phone with Apple Tech support and many escalations to various experts and the consensus is that they do not know what is causing the problem and no advice on how to fix it, and that's from top level Apple tech support.
They did tell me that iTunes is going under a major evolution soon, and I am not sure what that entails, but they did suggest I download the new under development Apple Device and Apple Music Apps from the Microsoft Store, which I did and it seems to resolve my issues in that iTunes interface is greatly modified under these apps and loads normally.
However, everything is not in one place anymore. I need to run Apple Device App for phone backups, and the Apple Music App to play music. iTunes only works for audiobooks and podcasts but ni no longer insists on deletion and reinstall every time it runs. They all seem to use the iTunes interface, but they just work differently.
For me I am able to easily backup my iPhones with Apple Devices app and that was my major concern.
All files, backups and libraries are unaffected and work seamlessly with the appropriate app.
It is all a work in progress, so we'll have to see what happens with time.