

If the file is not valid or of a different kind, you will not see 64-bit operating systems in the options of VirtualBox. iso file which will be used to load the guest operating system on your computer.

Furthermore, you should also have a valid guest OS.

They have to be removed for VirtualBox to work properly. Device Guard/Credential Guard: Device Guard or Credential Guard are applications which provide security of hardware and credentials on your computer.System Debuggers and VM Platforms: If you have installed system debuggers or other VM managers/platforms on your computer, they might conflict with VirtualBox for resources and cause some of the features not to work.It must be disabled to access the full features of the application. Hyper-V: Microsoft’s Hyper-V is known to cause issues with VirtualBox application.
