Using Bots in the Open Beta gives you an error message though when it crashes.If you've been adding bots, that's whats probably crashing your game.
Look in your Half Life directory for files with the extention .mdmpI have Dual pentium CPU 1,8Ghz, 4Gb RAM, a 512 Mb ATI videa card and video set to Open GL. Any clues? I add no bots. I dont even have to start a server before it shuts down