Hardware Virtualization is not an available setting in my BIOS nor is Hyper-V available in Windows 7. I should have noted in my original post I am using Virtualbox version 6.0.14 as version 6.1 kicked a virtualization error for which there was no setting to turn off Hardware Virtualization - this setting is available in 6.0.14.
However, now I’m thinking I may need to go back another version or two. Hmm, … But, if 64-bit is not an available selection in the newest version of Virtualbox, can I reasonably expect it to be an option in an older version? And, according to the error message, the problem seems to be a validation problem whilst booting Netrunner.
It should be noted, I did have a problem running Netrunner Live USB on this system as well. (Can't boot to live USB) Which SEEMED to be an issue with a GPU and was never completely resolved. That error, however, did not reference any issues with the kernel being incompatible.