Intel vt-x not supported on boot camp windows 7 (virtualbox and microsoft detection tool)

Hello,
I've a MBP mid-2010 that is running a Windows 7 Pro as boot camp partition (business needs).
I've installed virtualbox on the Windows 7 OS, but I can't access the "accelration" tab under the system settings.
When running an imported OVA system (that uses Intel VT-x) I get an error message saying :
"VT-x/AMD-V hardware acceleration is not available on your system. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot."
Using the Microsoft® Hardware-Assisted Virtualization Detection Tool, I get the confirmation that it is not available on my computer.
Which is really strange because it is working perfectly under Mac Os X Mavericks (and previous).
Anyone has an idea ?
Regards,
Franck.

I have this exact same issue, except I'm trying to use Hyper-V in Windows 8.1. Windows is running via Bootcamp 5, I have a late 2013 Macbook pro model.
I get the error message Hyper-V cannot be installed: Virtualization support is disabled in the firmware.
After poking around online, most information points to the Mac EFI firmware. It might be an update is available there that will help with VT-X
http://support.apple.com/kb/ht1237
However, there's no update for my particular Macbook. I've only found one workaround that I don't really know how/why it works.
1. Power off my macbook, completely shut down.
2. Hold the option key to boot into OSX Mavericks instead of Windows.
3. Restart from OSX and let Windows boot by default.
For some odd reason, VT-X is now enabled. This may be specific to my Mac. It's a Macbook Pro 2013, 15'' - '11,3' model.

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