Attached Link: http://windowshelp.microsoft.com/Windows/en-US/Help/3ca0e305-6118-43be-9d5a-7820f7da66e41033.mspx

http://msdn2.microsoft.com/en-us/library/bb173477.aspx

"Windows Vista provides the same support as Windows XP for OpenGL, which allows video card manufactures to provide an installable client driver (ICD) for OpenGL that provides hardware-accelerated support; note that newer versions of such ICDs are required to fully support Windows Vista. If no ICD is installed, the system will fall back to the OpenGL v1.1 software layer in most cases."

Sometimes it's easier to look up the facts than spend a lot of time discussing misinformation.