dee-ehn nuvision.ax is a video codec located in device manager .
im not entirely sure it is associated with PS . I assumed it is because after removing the codec file i was trying to render a avi file to mpg when in the middle of rendering PS stop responding and the screen went black. when i rebooted everything seemed normal until i played another mpg file i had the stuttering problem. when i checked device m the nuvision codec file had returned. thats when i tried reinstalling PS.