Well I had it on xp but then I upgrade to vista naturally there were many compatiblility issues when I upgrades. I fixed them all but one my graphics card which for some reason cannot be upgraded because bestbuy said that i didn't have enough ports in my computer... anyways so the reason I cannot use WMM is because i get an error saying that my graphics card isn't supported in this verison of WMM. So that is why I don't have a movie editor. I honestly didn't know graphics cards had a say in using a movie maker or not on vista but it does. So when I get my laptop then i can edit movies.