I am having a problem with the game crashing to my desktop at the same point in the jungle. It occurs when you encounter the smoke monster for the first time and are supposed to follow wreckage of the plane to the cockpit. After the first checkpoint, there is a part where you are asked if you want to stay in the jungle or go to the next area. During the loading sequence, the game always quits to the desktop giving me the following application error:

The instruction at "0x0051ef1c" referenced memory at "0x00021000". The memory could not be "written"

Here are my system specs:
WinXP Pro SP2
ASUS A8N-SLI Premium, Opteron 165 @ 2.64 GHz w/ AC Freezer 64 Pro
OCZ GameXStream 600W
2gb OCZ Plat XTC memory (on 3:4 divider)
500GB SATA + two 250GB PATA
eVGA GeForce 7800GT CO (factory overclocked at 475/1100)

Tried a whole bunch of difference forcewares, from the latest 171.xx and 174.xx to 169.xx but have now rolled back to 162.50. Getting much better framerates than on the newer drivers but the game still quits on me at the same point.

Ubisoft support, are you out there? Are you guys aware of the bugs in the game? Are you actively working on a patch? Do you have an estimated time or delivery for said patch? Hope you guys write back soon, thanks.

have you tried updating directx from the microsoft site.