That was the same msg I was getting with the solid blue cable. I ordered this cable from amazon plugged it in and it worked great. I am also running windows 8.1. http://www.amazon.com/gp/aw/d/B003ZKKMLE
I bought the soild blue cable to us with tuneecu and it would not connect to my bike. I ordered the blue connecter with the silver cable and it worked great.
08 all stock with TOR Exhaust it's running 20225 maps. I am getting some pop on decel is there maps that would work better on my bike or what changes should I make to the factory map to help all round performance.