RTFM :lol:
Voici donc un extrait puisque vous ne RTFMez pas :
1.6 64-bit guests
Starting with Version 2.0, VirtualBox also supports 64-bit guest operating systems.
Starting with Version 2.1, you can even run 64-bit guests on a 32-bit host operating
system, so long as you have sufficient hardware.
In particular, 64-bit guests are supported under the following conditions:
1. You need a 64-bit processor with hardware virtualization support (see chapter
1.2, Software vs. hardware virtualization (VT-x and AMD-V), page 11).
2. You must enable hardware virtualization for the particular VM for which you
want 64-bit support; software virtualization is not supported for 64-bit VMs.
3. If you want to use 64-bit guest support on a 32-bit host operating system, you
must also select a 64-bit operating system for the particular VM. Since supporting
64 bits on 32-bit hosts incurs additional overhead, VirtualBox only enables this
support upon explicit request.
On 64-bit hosts, 64-bit guest support is always enabled, so you can simply install
a 64-bit operating system in the guest.
Warning: On any host, you should enable the I/O APIC for virtual machines
that you intend to use in 64-bit mode. This is especially true for 64-bit Windows
VMs. See chapter 3.7.1.2, “Advanced” tab, page 46. In addition, for
64-bit Windows guests, you should make sure that the VM uses the Intel networking
device, since there is no 64-bit driver support for the AMD PCNet
card; see chapter 6.1, Virtual networking hardware, page 82.
If you use the “Create VM” wizard of the VirtualBox graphical user interface (see
chapter 3.2, Creating a virtual machine, page 32), VirtualBox will automatically use
the correct settings for each selected 64-bit operating system type.
Il s'agit de la documentation disponible tout à fait publiquement (ya qu'à se baisser pour la ramasser) sur le site de VirtualBox à l'adresse suivante :
http://www.virtualbox.org/wiki/Downloads
Dans le deuxième chapitre "User Manual" il y a un lien sur la documentation (PDF) dont le chapitre ci-dessus est extrait.
Il est donc très clairement stipulé qu'il te faut activer le VT pour faire tourner un "guest" 64 bits... et visiblement ton processeur ne le supporte pas.
Ca ne marchera donc pas sur ton PC, à moins de changer de processeur, ou de passer à un client 32 bits.
CQFD
