Sorry its a bit late in reply...(1/2 a year) but I wanted to put this out there in case anyone else has one of these boards and is running into the same problem.
The board officially does not support Virtualization as in this article on the Intel site:
However Microsoft's detection tool suspects that the technical level of the system should be able to handle it. (I'm not entirely sure how its drawing the conclusion but it does check something) I found some things in the bios which looked like it would apply but the detection tool still comes back with "Hardware-assisted virtualization is not enabled on this computer" - At least it doesn't come back with a solid 'NO'!
According to Microsoft you should still be able to run the virtualization by applying this hotfix: "Be aware that XP Mode will run much better if hardware-assisted virtualization can be enabled."
I shall try it on the system I'm workin on and hopefully I can get it going!
Otherwise its purely a BIOS/Motherboard issue
Snuggs is right ,I found out your problem then got a DX48BT2 which does support running XP Been there done this works find on the Bonetrail.
Well I'll be darned! Something was nagging in the back of my mind... Why would it tell me that I might be able to use Virtualization...
So I dug deeper after finding the info on Intel's website that said I couldn't I found several mentions that I could!!!
So perhaps I figured my CPU just didn't support it. After running the Intel CPU checker it indeed checked out as Virtualization capable.
What have I been missing? After spending some time in the BIOS--making changes then rebooting and testing I finally found a combination that works!!!
I used the latest BIOS first of all: BTX3810J.86A.2006.2009.1023.1057 (according to the bios info screen)
Under the SECURITY tab make sure the options read as follows:
Expansion Card Text (Disable) - but shouldn't matter
Chassis Intrusion (Disable) - but shouldn't matter
XD Technology - (Disable) (I believe this one made the difference!)
Intel Virtualization Tech (Enable)
Intel VT for Directed I/O (Enable)
Virtual Appliance VA Operation (Enable)
User Confirmation required (NO)
VA Config Interface (Unlock)
Then all of a sudden my machine now supports Virtualization especially when you run the Microsoft checker
Hope this helps someone out there!