How To Fix Minecraft Error 126 on Windows 8
If you’ve upgraded to Windows 8 and got your ATI drivers and noticed that when you ran a program that used open GL you were greeted by and error message. Well this is a fix for that.
Open Command prompt as administrator and navigate to System32
cd /d C:/Windows/System32
copy atio6axx.dll .dll
If your graphics card has an M (Mobility radeon 7570M) use this
copy atio6axx.dll atiogl64.dll
copy atioglxx.dll .dll