well. i have one machine i did a clean install of windows on and reset. turned sli off the nvidia card. no probs with pes. the other machine i have not reinstalled windows.i pes smooth few seconds hen stutter then smooth. i highly suspect there are some processes from other programs that causes the stutter. so my only advice now is a clean install. i've also thought about the amunt of time and money i've spent trying to get this game to work over the years. this year i can't be arsed.