virtualbox.org

When I try to create a Windows 10 64-bit VM, Windows 10 64-bit is not available, only Windows 10 32-bit option is available. The version list on lists Windows 32-bt operation systems. How do I get Windows 64-bit versions listed in the drop down list?

The version of VirtualBox installed is VirtualBox-5.1.8-111374-Win.exe.
The host the VirtualBox is installed on is Windows 7 64-bit.

I too face the same problem and cannot select Windows 10 64-bit. On another note, when I did get my hands on a 32-bit ISO image vbox failed to boot the OS. I can hear my optical drive spin up and vbox displays the Windows Logo, but then my optical drive stops and the Logo just stares at me.

Scottgus already provided a link to the FAQ, which is known to be complete.