Regarding ATI Radeon HD problem - Questions for people with Problem

[Iciclay]

- Graphics card: Crossfiring 2 of the following: ATI Radeon™ HD 4870 512 MB GDDR5 memory, DirectX 10, PCI Express,
- Operating System: Microsoft Windows Vista Home Premium 64 bit
- Driver version: ATI Technologies Inc. - 8.561
- What errors you have encountered: crash EXCEPTION_ACCESS_VIOLATION after being killed by the sentry in the cells then attempting to load the last save. Also crashes when I attempt to go back to the mess hall from the cells.

also - even after using the save file provided, it crashes randomly when i enter a new area at the "Loading..." screen