nvidia resolution

hello people! So in my case install the nividia drive and everthing run ok, the glx and compiz, all the 3d efects. But i can´t change my resolution, alwais stay in 1024x760 60hz never change. And yes i have change in the Sax2 and using the kwrite put the resolution i want 1152x900. The funny is before i install the drive of nividia i choose any resoluion i want. So someone have a light to me. I try a lot of things!! ps: the 3d games don´t work too. conf: nividia mx 4000