Every time I try to launch Blender that is already installed onto the desktop, the same message always show up saying: “Your system does not use 3D hardware acceleration. Blender requires a graphics driver with OpenGL 2.1 support…” I do not know what to do. Please help me.
What is your computer hardware spec ?
Try updating your gpahics card drivers
You could try using an older version, downloadable from https://download.blender.org/release/