NVIDIA Forceware 257.21 WHQL XP

* Upgrades PhysX System Software to version 9.10.0223.
* Adds support for OpenGL 4.0 for GeForce GTX 400 Series GPUs.
* Adds support for CUDA Toolkit 3.1 which includes significant performance increases for double precision math operations. See CUDA Zone for more details.
* Adds a new NVIDIA Control Panel setup page for SLI and PhysX for ultimate control over multi-gpu configurations.
* Adds a new NVIDIA Control Panel feature for ultimate control over CUDA GPUs, allowing the user to effectively choose which GPU will power each CUDA application.
* Includes numerous bug fixes. Refer to the release notes on the documentation tab for information about the key bug fixes in this release.
* Users without US English operating systems can select their language and download the International driver.