Win2K, OpenGL, and Translucency.

Have an engineering app that uses OpenGL.
All works fine for all flavors of windows
except win2k. Under win2k images that
contain translucency AND are rendered to
an off-screen bitmap do not work (translucent areas contain partially filled
opaque triangles). When rendered to the screen all works fine. I’ve heard that the problem may be the fault of the opengl driver supplied by microsoft and not the one supplied by the graphics card manufacturer.
Any help is much appreciated.