Jim,bought an actual drive for windows 11, have checked memtest and clean boot
does the minidump not really give any info?
I also have been seeing occasional, random, BSOD errors, usually "MEMORY_MANAGEMENT," almost always listed in "BlueScreenView" as being related to the driver, "ntoskrnl.exe."
Have you tried using WinDbg? After installing it, just go to C:\Windows\Minidump and double-click on a Minidump file. Then, click on the "analyze" link in WinDbg. Mine said something about a corrupt PTE (Page Table Entry).
As for the history of my problem, I purchased an HP All-in-One system about a year ago. At first, it ran just fine. Then, I decided to upgrade the RAM from 12 Gb to 32 Gb. Ever since installing the new RAM, I've had the BSOD problem. Although it might seem obvious that mine is a hardware issue, I can't really be sure of that. You see, the wonderful people at HP have denied me the ability to even SEE the "advanced BIOS" page. Apparently, there is some secret way to enter the BIOS, otherwise this page is hidden.
I can often go for about a week without getting one of these BSOD errors, but then sometimes they come almost back to back, and once I had to reinstall from a backup image.
Just to confuse matters for myself, at about the same time as the memory upgrade, I also set up a dual-boot arrangement, with Windows 11 and Linux Mint. Have you tried anything like that on your system?
As for running memtest86, you need to run it for at least 24 hours before you can say that it has "Passed." After a few runs, I eventually get numerous errors, although I haven't done any sort of analysis.
Arthur