HL2 Crashing

Every time I select Find Multiplayer server. My hl2 game crashes. Does anyone know how to fix this?

already a thread on this
http://forum.facepunch.com/showthread.php?t=1287278
search before you start a new thread

He can start his own thread, it shows that multiple people are having the issue.

The thing is that no one has found the problem for this on the other thread. Maybe people forgot to post the solution before they lost the post.