You have just installed the VirtualBox and you are about to setup a new 64 bit operating system. But, from the selections – you realized that only 32 bit operating system are available and no 64 bit operating systems!

If you just select the 32 bit operating system, you will also notify that the tab of Acceleration is greyed out (under the Settings > System).

Solution

Depending on the CPU manufacturers (AMD or INTEL), you will need to activate the Intel VT-x and AMD-V virtualization hardware extensions in the BIOS level. Once done, you will able to see and select the 64 bit operating system.

I experienced the same problem while trying to install a 64-bit version of Linux Mint inside VirtualBox. I opened VirtualBox, clicked on NEW, entered a name for the virtual machine, choose the type of operating system, but when I wanted to choose a version, I only saw 32-bit versions and NO 64-bit versions as an option. When I start VirtualBox, I only have 32 bit operating systems available. After some research I followed the steps on another post but to no avail. My host OS is 64 bit, Intel Virtualization Technology and VT-d are both enabled in the BIOS, and Hyper-V platform is disabled in the Windows Feature list, yet I still only am presented 32 bit.

Virtualbox Only 32 Bit Available For Windows 7

VirtualBox only showing 32 bit guest versions on my 64 bit host OS?