win8.1 installation VirtualBox only 32-bit option resolution

After installing the VirtualBox, you are ready to mount the system in the virtual machine and discover that there are only 32-bit options in the Virtual machine system option and there are no 64-bit options, what's going on? It's a computer problem. This is not the case with the same software installed on a previous computer.

Problem solving:

After querying the relevant information, understand that the virtual machine 64-bit option needs to meet the following conditions: 1. whether the CPU supports virtualization technology; 2.bios Virtualization Technology Support is not open;

3. Is there any other software that takes up virtualization support, which also makes the VirtualBox no 64-bit option.

First of all my CPU virtualization is definitely supported, so I go into the BIOS to see if virtualization support is not turned on, restart the computer F1 (different computer options will be different) into the BIOS select security->virtualization-> Enter Then select Disabled Carriage return to Enabled F10 save reboot OK. Such as:

(Figure I)

(Figure II)

win8.1 installation VirtualBox only 32-bit option resolution