A new version of NVIDIA PhysX System Software has been published. This new version 9.09.01.29 is WHQL certified. This is essentially a bugfix release based on PhysX system software 9.09.0010 to resolve installation issues on non-English operating systems.
You can download PhysX 9.09.01.29 HERE @ NVIDIA.
PhysX System Software is required for all applications using PhysX technology no matter the graphics card you have (NVIDIA, ATI, S3 Graphics, etc.). With a NVIDIA GeForce 8+, you will enjoy hardware acceleration via CUDA. On other videocards, PhysX will use the CPU to do its job.