After patch 1.02 I was getting the memory access error from mm.exe and the dx 8 and 9 error crashes. I have the dvd version of the game. I also have steam (from HL2) and when I would download and install a patch from Ubi steam would also update. I got to thinking that maybe this is causing some sort of conflict so I rebooted my comp and shut down Steam and tried again. Prior to this patch I was never able to get past the loading screen to chapter 4, but I am now on chapter six with no problems (as long as I don't try to load one of my saved games, auto saves are safe to load so far). Just a thought that might help some. Let me know if it works for you.