Blender 2.7x works on nearly all operating systems. To use Blender, just unpack the archive you find in the download section and start Blender!
Graphics card note: Blender runs on all OpenGL-compatible cards, although there are some issues with integrated graphics cards (Intel, Via). We therefore can’t officially support and guarantee that Blender works fine on those systems.
Blender is available for Windows XP through 8, Mac OSX 10.6 and above, and Linux. Blender uses OpenGL for drawing the entire interface. This means it’s best if you use a graphics card that is OpenGL-compliant.
The Blender developer team welcomes all efforts to bypass issues with specific configurations, but we can only officially support the platforms that are in use by active developers. Check the wiki for a list of supported platforms.