"VT-x is not available" when I start my Virtual machine

I have created a virtual machine using the VMWare software and getting an error while starting the Virtual Machine. It says "VT-x is not available:

00:00:03.916 NAT: zone(nm:mbuf_cluster, used:0)
00:00:03.916 NAT: zone(nm:mbuf_packet, used:0)
00:00:03.916 NAT: zone(nm:mbuf_jumbo_pagesize, used:0)
00:00:03.916 NAT: zone(nm:mbuf_jumbo_9k, used:0)
00:00:03.916 NAT: zone(nm:mbuf_jumbo_16k, used:0)
00:00:03.930 VMSetError: D:\tinderbox\win-4.0\src\VBox\VMM\VMMR3\VM.cpp(350) VMR3Create; rc=VERR_VMX_NO_VMX
00:00:03.930 VMSetError: Unknown error creating VM
00:00:03.931 ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={515e8e8d-f932-4d8e-9f32-79a52aead882} aComponent={Console} aText={VT-x is not available. (VERR_VMX_NO_VMX).
00:00:03.931 Unknown error creating VM (VERR_VMX_NO_VMX)}, preserve=false
00:00:03.944 Power up failed (vrc=VERR_VMX_NO_VMX, rc=E_FAIL (0X80004005))

Any idea why I am getting this error?

You might try reducing your base memory under settings to around 3175MB and reduce your cores to 1. That should work given that your BIOS is set for virtualization. Use the f12 key, security, virtualization to make sure that it is enabled. If it doesn't say VT-x that is ok, it should say VT-d or the like.

VT-x can normally be disabled/enabled in your BIOS.

When your PC is just starting up you should press DEL (or something) to get to the BIOS settings. There you'll find an option to enable VT-technology (or something).

Are you sure your processor supports Intel Virtualization (VT-x) or AMD Virtualization (AMD-V)?

Here you can find Hardware-Assisted Virtualization Detection Tool ( http://www.microsoft.com/downloads/en/details.aspx?FamilyID=0ee2a17f-8538-4619-8d1c-05d27e11adb2&displaylang=en) which will tell you if your hardware supports VT-x.

Alternatively you can find your processor here: http://ark.intel.com/Default.aspx. All AMD processors since 2006 supports Virtualization.