Check your supporting chipset, and also what drivers you have installed. Last would be to make sure you BIOS is not missing a patch that would enable VT.
There are times where a CPU would support VT but the chipset and associated drivers do not.
I do not work for Lenovo, I only provide suggestions based on my personal willingness to help others. All advice and comments are based on my experience, and do not reflect Lenovo policy, terms or conditions.