Windows 7 Virtualization support for x64 CPU

I have been using VMWare and VirtuaBox on Vista x64 bit successfully to create 64 bit guest OS (Windows 2003 x64 and Windows 2008 x64). But when using the same software and same images on Windows 7 x64, I received an error "... this CPU is not capable of support x64 bit OS..."

Is there a configuration or setting somewhere that disable the Virtual Technology bit in Windows 7?

Advance thanks for any help.

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