NVIDIA has released WHQL-certified GeForce 181.22 drivers for its GeForce 6, 7, 8, 9 and 200-series graphics cards, as usual you can download it over here. NVIDIA states this is the recommended driver for the best GPU PhysX experience in Mirror's Edge.
This driver is recommended for the best GPU PhysX experience in EA’s hot PC title Mirror’s Edge.
This driver package automatically installs the new PhysX System Software version 9.09.0010.
Additional information on specific bug fixes can be found in the release documentation notes.