I previously had an older version of Quicktime, and everything worked fine so I downloaded all those Phantom Menace trailers and tome poems. Then they introduced the Quicktime 4, and all my files wouldn't play right. The audio plays with pops throughout, and the video is slow, seemingly skipping frames in order to keep up with the audio. If I try to play these files with my previous version of QT, the audio is fine but no video at all. I just downloaded the ne QT 5, but it plays the same as QT4. Is there anything I can do to fix this prblem?