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VT-x/AMD-V hardware acceleration has been enabled, but is not operational. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot.

Please ensure that you have enabled VT-x/AMD-V properly in the BIOS of your host computer

I have ticked Enable VT-x/AMD-V but got the error message when I tried to boot the Windows 7 64-bit as a guest using Sun VirtualBox 3.0.8

enable vt-x amd-v

The solution to this problem is actually upgrading my BIOS from A03 to A05 update released last week for Dell 1440. After updating the BIOS, I re-enabled the Intel Virtualization support in the boot setup. It worked like a charm after that. So why don’t you try to check if there is a BIOS update for you motherboard first.

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