Need help fast! I uploaded and made a series of videos without realising the sound wasn't working on the clips I was using, and managed to fix the sound issue on the original clips, but if I go to re-upload them to re-make the videos with sound this time they stay without sound, because they have already been 'analysed' once by MM and it 'knows' them. How can I re-upload my clips and make them work with sound? (You know when you use a clip for the first time it prepares the video for playback quality before you can play it, basically I need to get it to do that again to all the ones it has already done.)

I hope I explained that okay...I am using Windows Live Movie Maker on Windows 7 Starter, and the video has to be done before Tuesday. Any help would be much appreciated!