How can I make a driver the default driver?

I’m using Win95 OSR2 with IE 5. I’ have 2 OpenGL drivers installed: one for the primary video board (Cirrus Logic GD5446) - software, no HW acceleration - and one for the 3D accelerator card (Voodoo 1).
How can I make the second driver the default driver? For example I need this to make Windows screensavers use the Voodoo 1 driver and not the software one.
Thanks in advance.