After you updated the BIOS, are you able to see any option for VT under the following tab:
BIOS -> ADVANCED -> PROCESSOR -> VT
BIOS -> ADVANCED -> PROCESSOR -> VT-d
You must be able to see the following options. Go to the VT option, enable it and then remember to POWER RECYCLE your system but NOT RESTART. Restarting your system would not save the VT enable settings resetting it to disable and it is necessary for the VT to be enabled that once you make changes in the BIOS, you power recycle your computer.
Let us know how it goes.
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