Geforce 4

Hi I have a problem with opengl games under windows xp. I run my desktop at 1280/1024 at 32bit colour and 100hz screen. The problem is that all my opengl games will only run at 60hz. No mather what screen size I choose in the game. All my direct 3d games are fine they all run at 100hz. Does anybody no how I can change the default opengl setting from 60hz to 100hz? Thanks Alan