Sorry I am responding late. I hope my contribution will be of help though. I managed to resolve the issue but not by uninstalling Hyper-V. I saw a couple of suggestions but I find this one situable (it makes sense since I’m not an IT guru):
Open the command prompt as an Administrator.
Run the command with no argument: bcdedit
After you run the above command, you will see that the property hypervisorlaunchtype is set Auto by default. See screenshot below:
Disable Hyper-V by running the command: bcdedit /set hypervisorlaunchtype off
Restart your PC system to use VirtualBox.
To turn Hyper-V back on, run the command: bcdedit /set hypervisorlaunchtype auto
You will need to reboot the system to use Hyper-V.