I get the following error (and yes I know this has been reported many times, but please read further): VT-x/AMD-V hardware acceleration is not available on your system. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot.

The issue is that Virtualisation *is* enabled in my BIOS and I also made sure my BIOS is upgraded to the latest version. I also confirmed it with the Coreinfo.exe (​http://technet.microsoft.com/en-us/sysinternals/cc835722.aspx) tool. Here is the ouput of that tool:

Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
Intel64 Family 6 Model 42 Stepping 7, GenuineIntel
HYPERVISOR      *   Hypervisor is present
VMX             -   Supports Intel hardware-assisted virtualization
EPT             -   Supports Intel extended page tables (SLAT)

Here is the thing: I used VirtualBox on the same machine, but with Windows 7 and I could run exactly the same x64 guest images.