Original help was identified from this article Why is VirtualBox only showing 32 bit guest versions on my 64 bit host OS?
In browsing through the comments, I saw mention that the root issue is that Hypervisor running interferes with Virtualboxes virtual management, so I disabled Hypervisor service, repaired the install, and rebooted. I also disabled automatic start for Hypervisor.
This resolved the issue without requiring the uninstallation of the Hypervisor feature in Windows.