My game crashed on this Window App event message, "Faulting module name: d3d9.dll, version: 2.0.3.1120, time stamp: 0x570150f8" when I needed to upgrade to patch 4. I just removed a few of the SweetFX files AKAK mentioned (d3d9.dll was one of those files) in a previous post to unlink SweetFx from AHIII. Once this was done the game continued normally with getting patch 4. I re-installed SweetFx with patch 4 and it worked okay.