There's a lot of stuff all over the place about TuneECU and the Triumph ECU's wanting a cable with an FTDi chipset. Since I'm in Europe anyway, I hit up Lonelec in the UK who claim to be highly compatible and had no issues - installed the drivers first, then fired up TuneECU, connected the cable up to the bike, turned the bike on, connected the cable to the computer USB port and presto, automatically connected.
Most likely your laptop was doing something driver-related when you plugged the cable in, but I think if you first install TuneECU, then download and install the cable drivers, hook the cable to the computer so it activates the drivers for it and then go into the garage, you'll be good.