Unfortunately, there are no specific errors listed.
Just a thought, maybe the save game you're loading in Chapter 16 was made before the patch? Loading pre-patch save games in the patched versionof the game may fail immediately or cause problems during next load or level transition.
Zip your working save from level 16 and upload it here, let's try to load it on another PC.
BTW, you do realize that shaders 4.0 (and, consequently, advanced PhysX effects) aren't available on XP, right? They require Dx10.
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