In case this helps others:

I tried do as advised above. Some problems were solved for a while but could come back or new ones came up. I think I was doing more harm than good.

I sorted all the...

Ok got it. Thanks for the explanation.

zbook.
Can I immediately install Avast Free Antivirus for better protection that Windows Defender?

Hello zbook.
I will do as you say.
Should I also uninstall SpyBot Search and Destroy as I believe it uses the BitDefender engine?

Thanks for your replies.
Re other AV software I attach a screenshot from a Belarc Advisor scan that lists all the software installed on my PC.
I have highlighted some.

I also attach a Backup...

I am repeatedly getting a BSOD. Log zip attached.

Initially it was CLASSPNP.SYS crash and auto reboot whereupon it would work ok for a while. Picture attached.

BUT JUST NOW IT WAS "MEMORY...

Ok, so only Bootable drives will be allowed in the Boot list. I suppose my N1-Samsung SSD 950 PRO 256G drive, with W10 on it, isn't on it's own bootable but is through Windows Boot Manager. The SSD...

What I can't understand is that with CSM off and Secure Boot on there are "NO" device entries in UEFI boot list other than "Windows Boot Manager"! They are in the Sata Information list but not in the...

Thanks Alphanumeric,

Just tried CSM off and Secure Boot on. The ONLY "Drive" I can then see to select, anywhere, in the UEFI Bios is "Windows Boot Manager"
Right clicking in Disk Managment in W10...

Thanks for the reply. So Ok I shouldn't worry about no UEFI prefix.
How do you have the Compatibility Support Module (CSM) and Secure Boot set in UEFI Bios?

Philip

I have installed Windows 10 pro on my self built PC using an Asus Z170-A motherboard. I used a USB in UEFI mode made using the Windows media creation tool. Motherboard BIOS updated.

I have these...