I just purchased my computer this month.  It is an HP running on Windows 10.  I have downloaded Movie Maker to make the annual graduation video for our Senior Class at school.  The first few times I playback what work I have done so far, it will play nice and clear.  But after I add more and more things and play it back a few times it will all turn blurry.  Why does it do this and how can I fix this problem?