Thank you, Noel!
I found that box with the options to put on a specific HD. I don't know why I missed that in previous attempts, except maybe I had chosen the option one, which does not bring up the choices?
It is written in very very small fonts, I wonder if that is my system or the software?
In any case, this time, I found it thanks to you, and it seems to have installed correctly. In looking at what IS installed now, on the C drive, it's still about 20GB... does that seem normal, for just the operating core of the software? (I'm thinking of the possibility that my previous attempts (like I tried option 4) put more on the drive, and now that I have done the full install on my D drive, there are extraneous files on the C that I could get rid of? I would think it would be a lot less than 20GB. But I wouldn't want to delete and re-install just to find out that's what it really is.
Thanks again!