I have purchased and downloaded minecraft through mojang. When i open minecraft it tells me I can not play with out OpenGL 2.0. How do i download this or how can i get this on my computer so i can play?!?!

Install the latest graphics drivers for your GPU.

If you don’t know what GPU you have… If you’re on Windows, install and run a program like CPU-Z or GPU Caps Viewer.

For more details, see Getting Started in the OpenGL Wiki.