I can't import into IMovie from a DVD I have previously made and have in my computer. I do as HELP says and go to Import, click on my DVD file, computer seems like it is downloading something for about a half second but nothing shows up. When I look at the file on the Hard drive, there is no space taken up. It obviously didn't download. Can I download from a DVD in my computer? If so, how? If not, what are the alternatives?