OpenGL lockups

OpenGL games lockup in Win98. They work fine in Win95. The work fine on my Monster 2 card in Win98 but if I tell a game to use my primary card (Viper V770), it locks up. The TNT2 works fine in Win95 though. I have tried removing the voodoo card but that doesn’t help any. Direct3D and DirectX and whatnot all work fine, it’s just when a game initializes OpenGL, it locks up. I’m using version 6.47 of Nvidia’s Detonator drivers (latest version).