hi, i have a mobile(r) 4 series express chipset famiy, i play such games as fifa 11, 12 and nba 2k10, the game starts up very well and graphics are good but at the start of gameplay the game starts to slow down and not run smooth, wat is causein this problem ? is it the graphic card ? wat settings or so cud best be used cause ive tried different settings and stil get the same results am i doing sumthing wrong can anyone help me ?