( Oracle VirtualBox 4 on Windows 7 64-bit ) + ( CentOS 5.6 64-bit ) = " Your CPU does not support long mode. Use a 32bit distribution "

Question

• VM: Oracle VirtualBox 4.0.10 r72479
• Host OS: Windows 7 64-bit
• Guest OS: CentOS 5.6 64-bit

Downloaded a ready-made image of the guest OS from here.

When running, CentOS tells me:

Your CPU does not support long mode. Use a 32bit distribution.

Also mounting the original distribution's DVD doesn't work.
What's wrong? It happened me before with other OSs (in VirtualBox only) but now I actually need that.

Any way to resolve this or should I use another VM tool? Google search doesn't give much.

Edit #1
Some of my system's details:

CPU Type: DualCore Intel Core 2 Duo E7300, 2666 MHz (10 x 267)
Motherboard Name: Asus P5KPL-CM (2 PCI, 1 PCI-E x1, 1 PCI-E x16, 2 DDR2 DIMM, Audio, Video, Gigabit LAN)
Motherboard Chipset: Intel Bearlake G31
BIOS Type: AMI (01/26/08)

Solution

Does your host machine have hardware virtualization support (VT-x/AMD-V), is that support enabled in the host BIOS, and is the option for hardware assisted virtualization checked in the virtual machine configuration?

Having working VT-x/AMD-V is a requirement for running a 64-bit guest.

Comments

[Poni]

Nevermind, found the answer to that :/ Thank you anyway !