Kindle problems

I have downloaded and installed both Kindle Create and Kindle preview on my computer. (Desktop, running Windows 10, release 20H2)

I want to see what the e-version of my manuscript (all formatting removed, just plain-vanilla Times New Roman font) will look as an e-book, so I fired up Preview. The program opens, I select the file, it reports that it's performing the conversion ... and then it just disappears. The computer doesn't crash -- everything else remains unchanged but, suddenly, Kindle Preview isn't running any more.

So then I tried Kindle Create. That's even worse. The program open. I tell it I want to set up a file for re-flowable text. As soon as I select the file I want to open -- the program just goes away.
I opened Task Manager as a check -- the programs aren't running somewhere in the background. They just disappeared.

Does anyone have any suggestions?

AW Admin said:

I'm going to move this thread to the Self-Publishing forum where you are more likely to have responses.

Click to expand...

Thank you. I wasn't sure if I should put it in "Self-Publishing" or "Tech." So I chose "Tech."

Oops.

I found the answer -- I think. I let Windows check Kindle Create for compatibility, and Windows decreed that it should run with compatibility set for Windows 8.

And it ran.

However, no such luck with the Kindle Previewer.

Did someone say "Call Amazon"? I've never seen any way to contact Amazon, especially by telephone.