I just got The Witcher 2 today and so far it seems quite enjoyable. The problem is that I haven't been able to play much of it so far due to lag that occurs even on low settings. The game recommends that I play on High, but this simply isn't possible; the game pauses every time I so much as turn Geralt's head. Any idea what's causing this problem and what settings I might need to adjust to get the game working at a normal, mostly lag-free speed?
My graphics card is the NVIDIA GeForce 9600 GT, and I have 4 GBs of RAM on my computer. My graphics driver is beta driver 275.27. All display specs can be found here(results from running dxdiag).