Website:: https://www.facebook.com/TheProgrammingPortal/. 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. When trying to create a Virtualbox VM recently I was only presented with the option of creating a 32-bit client. After a bit of research it turns out this can be caused by incorrect settings in the BIOS or by a competing Virtual Machine software cohabiting the system. First of all your CPU must support the virtualization extensions.
I use Windows 10 1511 64-bit.I installed the latest VirtualBox 5.0.10 r 104061.
When I run VirtualBox, I see only 32-bit operating systems for choice available.In BIOS Intel Virtualization is enabled, Hyper-V in Windows 10 isn't installed.
When running the installation of VirtualBox again, choosing Repair, afterwards I can see also 64-bit operating systems for choice, the problem seems to be fixed. But when I reboot Windows, the same problem arises, only 32-bit operating systems available for choice.