VirtualBox shows only 32-bit options - tried all solns referenced

I have the following

1. Win 10 installed as 64-bit
2. Hyper-V is unchecked
3. BIOS setting enables Intel Virtualization

Is there a way to diagnose this 'common' problem beyond the suggestions?

The PC is pretty old (Lenovo B570). Is it possible that this is a dead-end and I should just install 32-bit Ubuntu?