Pimpbot I thank you, I downloaded basic ffdshow and it recommended I removed AC3 and Xvid codecs and rebooting before installing ffdshow which I did and I thought I 'd check out Fallout again before installing ffdshow and guess what no stutter at all, I can walk through doorways and get occassional slight stutter which is removable by switching to another station and back again.It seems either AC3 or Xvid are not compatible with Fallout so I'd recommend removing any of these codecs or similar if anyone else is having the same problem.I did have an extra station that changes Agatha's violin music but these were already in mono so no problems there. Again I thank you for putting me on the right track, kudos :thanks: