Where do I get OpenGL 1.2 and higher

I’m a new OpenGL user, I’ve read the specs for some texturing functions and wanted to use them in my C code, but they require OpenGL v1.2 or higher. Windows XP, which is what I use, ships with v1.1. How do I download/purchase/install or otherwise access later OpenGL versions?

Read this page : http://www.opengl.org/resources/features/OGLextensions/

and particularly this part :
6 # Win32’s Scheme for Getting Extension Function Pointers

BTW, you’d better try the “Opengl coding: beginners” forum, insterad of this one. Such answers have been answered zillion times.