unless you have a displacement on your poly, the tesselation has no effect at all to the render. to get rid of the steps you could increase your anitalias setting in render globals or model with more detail. you could also convert the polygon to subd or smooth it to have nicer edges. if only certain edges need be differant you can soften or harden the edges (i think edit polygons->normals->soften/harden).
hope that helps
p.s.: saying it is urgent is not gonna make me get up earlier