Windows 10: Two instances of Windows 10 on one computer; active version inexplicably changed.

There are two instances of Windows 10 on this computer, one each on two separate physical drives. I do not understand why the "active" version suddenly changed during a session two days ago 2023-07-22. I am finding the change disruptive to my work and want to return to the version of Windows and document tree that I have used without incident for the last 31 months.Background: I used to run a version of Windows 10 Home N upgraded from the original Windows 7 on a computer with one SSD. In December 2020, I experienced a sudden motherboard failure. A friend, a retired hardware vendor, built

:)

 

Inexplicable restarts

Thanks for your patient help and analysis, zbook. I'll step through some of your suggestions over the next few days - there's a lot to do and some look a bit hairy! That is, for a PC that is working sweetly right now...

Meanwhile, as requested in the BSOD thread (sorry, I misunderstood and posted there by mistake), I've attached both ZIP files.
--------------------
One step I did try right away was to answer your question about whether my BIOS is up-to-date. I had no success at the AMI site but did get some info from this commercial site:





It was one of the '9' (I counted 10) listed here:





Terry, East Grinstead, UK

 

Windows 10 Tweaks

Pressing “Windows+Pause Break” (it’s up there next to scroll lock) opens the “System” Window.

Windows 10: In the new version of Windows, Explorer has a section called Quick Access. This includes your frequent folders and recent files. Explorer defaults to opening this page when you open a new window. If you’d rather open the usual This PC, with links to your drives and library folders, follow these steps:

• Open a new Explorer window.
• Click View in the ribbon.
• Click Options.
• Under General, next to “Open File Explorer to:” choose “This PC.”
• Click OK

credit to Lifehacker.

 

Build 10240 - Any expiry on ACTIVATED versions??

I was going to do that for my benefit because of the way I have my partitions setup and to be legal with the EULA that isn't a step by step instruction. Right now I am waiting to see if build 10240 is actually the release build and yes I know at lot of people don't believe 10240 is the release version. I still may need to do that if build 10240 is not the release version.