Quke III.Shall I reinstall Win 98? Pls help!

I have an Athlon XP 2400+ PROCESSOR,256 DDR RAM.on an Asus motherboard with integrated video graphics,and no acclerator card.I have been playing Quke III on this machine quite for some time but suddenly today before the screen loads the message shows “Could not load open_GL subsystem”.From where do I download this open GL for my Win 98.Pls help!
Do I have to reinstall Windows 98 or is there some driver which can solve the problem.Pls help somebody.