I always had problems with Studio 8 before I gave up and moved on to using Movie Maker. I always had problems with video and sound sync. If you're having a problem with it, I highly recommend that you check to see if there are any new updates for Studio 8 first, as alot of bugs get fixed that way. DirectX always caused a problem too for me. This may not be anything to do with your problem, but it's worth checking that you've got DirectX9 or higher.
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