Exception acces violation error

[saloe]

We are in the final part of the chemical lab. After running through the tunnels with the 2 minute determination warning when we arrive at the end and we want to enter the door back to the shelter, the game crashes over and over again.

We ran new drivers, sound and graphic, but nothing seems to help. Running the game patch also doesnt work.

error code: Exception acces violation

Please help!
greetz Saloe

:-(