Try the 197.44 drivers. They're available on NVIDIA's developer site (
it). They support all cards from the GeForce 6-Series and up, including Fermi. I've been using them with a GTX 480 and 9800 GT PhysX card, and it's worked well. I've not tried Metro 2033, but Dark Void, Mirror's Edge, and Batman: AA all run flawlessly.