We understand how frustrating it is to be unable to play the game with out crashing. However, we will try our best to get through the bottom of this.
Can you please post your dxdiag so we can exactly know what your set up is? Are you playing on a wired or wireless connection? Can you post a link with your speedtest.net? Also, have you already tried verifying your game cache to make sure Ghosts files are not corrupted?Verify Game Cache Files (GCF) - How To's - Knowledge Base - Steam Support.
Thank you for your cooperation!