Steam Launch Error 80? posted by Senor Cardgage Man on May 2013 - last edited May 2013 - Viewed by 1.6K users Flag Hiya, I'm trying to boot up Poker Night 2 to see if I can win GLaDOS' buy-in at last, but I keep getting a popup saying Steam Launch Error 80, and the game doesn't boot up. It was perfectly fine this morning. What's going on???