Intel® Virtualization Technology (VT-x) is supported by this processors, see the following URL: ARK | Intel® Core™ i7-3610QM Processor (6M Cache, up to 3.30 GHz)
What error message are you getting from VirtualBox?
Sorry for the late answer but anyway. The message from VB is something like: "VT-x/AMD-V hardware acceleration is not supported on your system. Your 64-bit VM wont be able to detect 54-bit CPU and wouldn't be able to boot. (I'm translating on the go, because my VB is not in English.)"