Are you running Windows XP? If so, plug in your tactrix cable and wait for the little bubbles telling you it sees the cable to pop up in the bottom right corner. Once its done right click my computer and go to properties. Then click the hardware tab, then "Device Manager." Towards the bottom of this list you should see PORTS (COM + LPT), click the + to expand and view all the ports. Make sure you have a port showing up next to your USB tacrix cable. If your all good there make cure you have the latest definitions for Enginuity.