Posted by : Amol Vaidya Monday, May 26, 2014
When I installed Oracle VirtualBox (4.3.8) on a 64 bit host (Windows 8.1/AMD A4 APU) I was surprised to see only 32 bit options to create guest VMs. I was running a 64 bit OS on my host, I know that my processor supports virtualization but couldn't quite understand why I wasn't seeing options to create a 64 bit guest VM. The solution that worked is that you need to enable virtualization in the BIOS. In many systems, this is turned off at BIOS settings. Once this is enabled, 64 bit options for guest VMs appear in Oracle VirtualBox.