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#21
Please complete the steps I gave you which you just quoted, yet ignored the last one.
Find a WIndows PC to burn PW CD ISO file to CD with Windows Image Burner, unless you can find a comparable image burner for Ubuntu.
Why don't you clone the whole drive? There are several tools available to do so for free.
Free backup software for home users in Windows 10/8.1/8/7/vista - EaseUS Todo Backup
They can run from boot and run in memory only, so if your hardware is ok, no blue screens yet.
It's also legal on the same PC.
You could also clone your whole drive on another PC to a new disc.
Don't boot with it on that PC !
Install the new drive on your failing PC, with if necessary a new version of windows and copy the old important files back into it's proper place.
After that you have to reinstall all programs, because your register has yet no strings to the old ones.
It's worth to try, because a failing drive may not boot.
Sometimes it's only a minor read-error that prevents booting.
Try scandisc and repair.
Did you change something like adding a new drive, or the bootup sequence may have changed.
(Like 2 active partitions or a forgotten DVD)
unmountable_boot_volume means that the bootmanager stucks.
A password on Bios could sometimes indeed prevent access to the protected bootvolume.