Hey I had faced the little bit issue in the portal 2 puzzle games. Whenever I try to run this portal 2 game applications then it runs without describing any error messages. But later on when I try to start the game using the menu presents in the game then it gives the game crashing error message. I donít know why this happens in the applications. I had inserted the ATI Radeon 2400 graphics card on to it and the other system configurations is also compatible with this game. Any help will be appreciates.