So i get 100% great Quality with Dvd play back but if i download a movie avi for example i open it with quick time and the video Image and Audio get stuck/stop but the Video time keeps going as if nothins wrong ive also tried vlc it helps but still same problem, and on youtube same problem can anyone help me out here? oh and i have 256mb Ram im upgrading to 768mb in a week is that the reason? please help thanks in advance