virtualbox.org

Hi,
First time user of VirtualBox. Trying to build Windows Server 2008 64 bit VM but I get this error as soon as I start the machine:
VT-X is not available. (VERR_VMX_NO_VMX)
Unknown error creating VM (VERR_VMX_NO_VMX)
Details:
E_FAIL (0x80004005)
Console
IConsole {0a51994b-cbc6-4686-94eb-d4e4023280e2}

I've enabled ACPI, IOAPIC, PAE/NX, and VT-x/AMD-V. I'm using VirtualBox 3.0.2.
I've Virtualiation enabled in BIOS and my host machine specs:
Intel Core 2 Duo T9600, 64 bit Windows 7 OS.

Any help is appreciated.

Thanks in advance!