If the disk is viable and you can read it running setup on the disk from within your current valid, licensed OS should perform an upgrade install as if you had performed the upgrade over the net
Thanks for your post. I tried that. It reached a screen so that one can choose "Change What to Keep", and I chose "Keep Nothing". After all finished, I thought everything was gone - just a clean copy of the Windows 10, Oops I found my old Word document files are still there.
Ztruker is right, one can not do a "Clean Install" with a non-bootable Win 10 ISO.
Dch48: Please don't take it as an attack on you, that's just not my nature. I only report what I found (so that other folks here know).
sn00ker: Thanks for offering help. I did the re-install (see Dch48's post), and chose "Keep Nothing". Whatever the problems from downloading/installing imgburn, they were gone. Thanks again for your offering to help.
Learner99 ... I'm glad things worked out for you but can I strongly suggested whenever you download a program and go to install always watch for the added stuff, those are usually nasty and you should always uncheck them and only install the program itself
I don't have a bootable Win 10 ISO disk yet. (I have a non-bootable one.)
By reading, eventually I will be able to make one myself.
After one has a bootable Win 10 ISO disk, how one starts the "Clean Install"?
1. Just insert that bootable disk, and turn on the computer. (suppose the booting sequence has been changed, CD/DVD Rom drive now has the first priority.)
And, it will start the clean install.
2. Or, one needs to do something else first, like reformatting the hard drive. (I have not done this kind operation for ages. No longer remember as to how to do it. Vaguely remember that I used a bootable floppy, A:, that contains Format.com. Turn on the computer and boot from the A:, floppy. Then format the hard disk.) After formatting completed, insert the bootable Win 10 ISO, then turn on the computer.
Appreciate very much of your help on this.
You don't need to think too much.
When you boot from DVD/USB it will ask you.
If you want a clean install just format your drive (after agreeing the license terms) and the installer will take care of everything. It will automatically make all needed partitions. See here for details.. Windows 10 - Clean Install - Windows 10 Forums
Only, backup your documents and photos and so on first.
Wait a minute.
If I reformat the hard disk first, using a bootable floppy (contains Format.com) in A:.
Then use Dch48's method to reinstall the Windows 10 using the non-bootable Win 10 ISO.
That seems to be a "clean install".
Then I no longer need a bootable win 10 ISO disk to do the "clean install".
Update: Thanks to Halasz. I put up the above post before I saw your post.
Appreciate very much of your time and help.
Won't work, though, because you will have no way of running setup.exe from the DVD - which is a Windows program - without having some version of Windows running which the floppy won't be providing. The bootable DVD loads a stripped down version of Windows used to run the setup.exe.
Thanks to both Halasz and NavyLCDR.
Now I understand what's needed and how to do a "clean install. (I hope).