Hello there. I have a problem with my Movie Maker. When I try to edit, a big majority of my video is greyed out and I cannot trim nor split the video. When I do edit some parts successfully, some parts just end up at a green screen. I don't know what's wrong, I have a Windows 8.1 laptop, AMD Radeon HD 7660G + 7600M Dual Graphics card and 8 GB of RAM. Please help, as I have no clue what is going on. Thank you.