I have just had my computer rebuilt, since then, every film I burn off the picture is good but the sound is way out of sync. Like running a minute or two ahead of the film. I had never had this problem before. I'm using Nero 7, using the same dvd-rw and the same discs, and still burn off at 2x like I always did. I've tried uninstalling and re-installing Nero to no avail. Any ideas please?