Hello.

I recently bought a used Lenovo with Windows 7 on it, and just a few days ago I got the free Windows 10 update. I make 1-3 videos every week, and I use WMM because I don't need anything advanced. Unfortunately, switching to Windows 10 has caused major problems with WMM. When I import video files, they preview completely fine. When I export my projects, though,  they come out as an unwatchable mess.

The videos flicker constantly, sometimes getting stuck and flickering between blackness and a still image, and sometimes flickering between two scenes at one time. Then, after it finishes exporting, the project itself goes completely mute. My computer is fully updated as far as I can tell, and I've been working at this all day, but I can't find a solution on my own. I know it isn't a playback issue, since I've tried playing it in every media player I have. I don't see how my video files would be corrupted if they're playing fine within WMM.

Thank you for your help in advance.