VT-d is not the same thing as VT-x.
See this link for an explanation: http://www.thomas-krenn.com/en/wiki/Overview_of_the_Intel_VT_Virtualization_Features
However it might be that it somehow is linked by the setting in your UEFI BIOS.
Note however that changing VT-x setting requires the machine to be power cycled in order to be effective.
In order to do so, for a desktop, just pull the power plug, with the machine shut down.
For a laptop you might have to remove the batteries to power cycle it.
For more details, also see this excellent document: Trouble-shooting Intel VT-x Issues
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Thank you for quick response. I realized that I was looking in the wrong section of my BIOS. Finally found the intel VT-x under CPU section. It's working now!