If you get this error:
GLW_StartOpenGL() - could not load OpenGL subsystem
and you use Windows, then do the following:
Step 1. Make sure your graphics hardware supports OpenGL in accelerated mode
Step 2. if you are sure that it does, then install the newest graphics drivers from your graphics hardware vendor - the drivers that come with Windows are not enough, because they do not support OpenGL (Windows provides only 'software mode' OpenGL library - that opengl32.dll, which is not a graphics driver).
Post a new thread only if after doing the above you still get the error.
To admins:
Please stick it!