|Only on Macs... :(|
THE VIRTUAL MIDI PORT IS ONLY AVAILABLE ON MAC!
The solution for PC:
There are some software solutions out there that will help you sync Traktor and Ableton without any cables or hardware.
I've tried MIDI Yoke earlier, but upgrading to Traktor 1.2 I got some major issues with my midi controllers and it's said to have some issues with 64 bit OS aswell so this time I tried LoopBe1 from nerds.de and it worked perfectly.
It's simple and easy to set up and you should try it if you want to integrate both Traktor and Ableton on one computer.