Error message when trying to open blender I have downloaded blender but an error comes up ...can't detect 3d graphics card...blender requires card with open GL 2.1

How do I get this driver?...I am on windows 10

Thanks
https://www.khronos.org/opengl/wiki/Getting_Started#Downloading_OpenGL

In the contents, it has 2. Downloading OpenGL
The link varies by Operating System

Read your Graphics Card Vendor notes about openGL support.
For instance, NVIDIA has notes about openGL support here:
https://developer.nvidia.com/opengl-driver

Hope that helps.