amnesia problems?

[matches81]

Taking a look at your log and comparing it to the "Troubleshooting Guide" found right at the top of this very forum, it seems the game is using an integrated graphics chip (on-board GPU) instead of your ATi card (see A.5 in the troubleshooting guide).
Take a look at the thread "amnesia uses wrong graphic card", too. Perhaps there's a similar option in your ATI drivers to the one Steezy shows in that thread for the nVidia drivers.
Fallback solution would be to disable your onboard graphics card altogether.

If you don't have an onboard graphics card, I don't know what's wrong, but posting your PC's specs might be a good idea anyway.