No OpenGL Graphics card found

When I start up this one game I get the error “Error: No OpenGL graphics card found” but the game will start anyways but extremely slow, and if i put it in 16 bit color with a certain resolution and fullscreen it won’t go slow but words don’t appear, they just appear as like boxes and it’s hard to tell what’s going on, anyone have any idea what the problem is? I’ve tried downloading recent drivers but still doesn’t work, I’m running a Windows 98 Compaq presario and my display driver is RAGE LT PRO AGP 2X