Hi ,
What steps can I take to reproduce this on my end? Does it always occur in game or are you crashing from the main menu? Is it in online play or single player against bots? Are the maps/weapons you are using custom or are they the stock weapons/maps in the game? Do you do anything in particular before the crash occurs (for instance, does it always crash while jumping/sliding/etc)? Can you post your dxdiag here so I can take a look?