After you opened the game, press the ~ button to open the console and type map de_dust. This will start de_dust map. If you aren't experience any problems in running the game, the behavior that you experience can be caused by your video card. In this matter, I suggest to update its drivers and start the game again. If the map doesn't start, it's advised to uninstall the program and install it again. To be noticed that you should always use official packages to install games / programs. in this matter, visit the Steam Store in order to download the game.
