Movie maker says “directory name is invalid”, I use Windows 10

please help me.. I'm using Windows 10 and yesterday was the first time I used Movie maker. It was in my computer automatically, I didn't download it. I made a movie and today I tried to open it but it said directory name is invalid. then i tried to open the movie maker but it said the same thing as my movie did. I tried to find Windows essentials from my programs but I can't find them, I can't find even movie maker from there (I used control panel). What should I do now? The problem might be that I was stupid and downloaded fake Windows movie maker before I realised I have the real Movie maker in the computer. I didn't pay anything for the fake movie maker and I didn't even use it, I just uninstalled it and started to use the real movie maker. And now it says the directory name is invalid, please help! I hope my text isn't too confusing..