Docker for Windows won't install because I don't have Hyper-V, but Docker Toolbox won't run because I have Hyper-V

There is another similar post here for the same problem.

In that post they mention the bcdedit command to disable Hyper-V

To disable Hyper-V in order to use VirtualBox, open a command prompt as administrator and run the command:
bcdedit /set hypervisorlaunchtype off
You’ll need to reboot, but then you’ll be all set to run VirtualBox. To turn Hyper-V back on, run:
bcdedit /set hypervisorlaunchtype auto
and then reboot.