While I was writing my long post detailing my frustrating failure to isolate the BSOD cause, pk’s post arrived announcing that it’s already been fixed.

As I said before, I had disabled the firewall, Defense plus, and the sandbox but I never considered uninstalling Comodo.

In his linked post pk wrote:

I still add new & new features even between two public builds. In 1035 build I included better win32k.sys & ntdll.dll hooking, however Comodo IS wasn’t expected such non-standard hooking variant (in fact, its component guard64.dll corrupted ntdll.dll file which led to wininit.exe crashes). I removed the problematic part, because we won’t wait than they’d fix it.

corrupted ntdll.dll? Wow!!

Anyway, I eagerly await the next release and thank you all very much for your help.