Problem installing Vista 64bit with VirtualBox on a Vista 64bits

I want to configure a Dev VM on my Windows Vista 64. But the installation shows the following error:
Attempting to load a 64-bit application, however this CPU is not compatible with 64-bit mode.

I have windows Vista 64 bits, but it seems like VirtualBox is defining the VM with a 32bits processor.

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Pete_ZedConnect With a Mentor Commented:
It seems that you need a EM64T VT-capable processor to be able to load a 64 bit OS under a virtual machine.

For VMware, there is a utility and docs to look at here:

Check you BIOS to see if the VT option has been disabled. Enable it if at all possible.
Select Windows 7 (x64) as Operation System when configuring the VM
Sorry should say use Windows Vista (x64) as Version
I'm using VirtualBox in german
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Looking on the VirtualBox web site, it states this for running 64 bit guest OS's:

64-bit-VT or AMD-V capable CPU
Ensure AMD-V is enabled in BIOS
jjcamachosanchezAuthor Commented:
My VirtualBox don't have any 64 bits OS Option

I'm Ussing 3.0.0 r49315
jjcamachosanchezAuthor Commented:
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