By default, VirtualBox only allows to install 32 bit OS on it. But sometimes, 64 bit OS is wanted for specific uses such as running platform specific tests. To allow installing 64 bit OS on VirtualBox. Below information is needed.Here is the official documentation about 64 bit OS:VirtualBox supports 64-bit guest operating systems, even on 32-bit host operating systems, provided that the following conditions are met:You need a 64-bit processor with hardware virtualization support (see the section called “Hardware vs. software virtualization”).You must enable hardware virtualization ...