I have the same problem. I'm on Windows 7 64bit with a Radeon 5850.
Here is the game set to low textures with no AA:
http://i.minus.com/iRr1DeusfurE4.png
Here it is set to high textures with 8xAA:
http://i.minus.com/i0xqCcSHg21Ma.png
The textures on the house now have bump mapping, but nothing else changed. AA doesn't work at all. I am curious about why this might be because AA also does't work on The Witcher 2.