i can`t find update driver for my graphic card ATI RADEON HD 512 MB LAPTOP NOTEBOOK GRAPHIC CARD.I WANT TO PLAY MASS EFFECT 3 PC GAME BUT I CAN`T INSTALL PHYSX 9.12 ON MY LAPTOP.PLESE HELP
What is your laptop's manufacturer? You'll have to download them from your laptop manufacturer's website, and not from AMD.
Alternatively, you can do what stingstan told you to.
You can't install PhysX drivers on an AMD card, they are meant only for NVIDIA.