I upgraded to Windows 10 yesterday, now Movie maker isn't working right, nor is the default video player.  Movie maker is still there, just doesn't import the MP4. All I get is a blank video, also the default player will play one mp4, then I'll try another and it says it doesn't support the video format.  Is there going to be a new movie maker release?  I can't find anything to edit my videos now, if I had known about this issue, I wouldn't have upgraded yet.  Please let me know what the fix is.