cannot import video edited on imovie app

Please help, im a pc user trying to import a video I have edited using imovie, i have exported it to my camera roll but it will not import when I use picasa or any other way you can import using a mass storage device on a pc, Ive tried everything, dragging and dropping from my computer. Any ideas??? by the way this is happening with two different iphones I own. cannot import any video edited with imovie