ive done it before but now suddenly I cannot. every time I try to edit a mp4 type file I get all the way to publishing and end up with yellow caution triangles dictating my file is either corrupt or not supported. I can get the file to play on other apps but not my currently updated version of movie maker. I just want to know what I can do to get it to edit and finish a project sans buying a computer and a photoshop based movie editer.

***Post moved by the moderator to the appropriate forum category.***