Some videos not playing in OSMC

Hi Everyone;
I’ve just recently purchased a R-Pi3 and installed OSMC on it. I downloaded Samba and set up a share on both my Win *.1 and Win 7 machines. They are all on the same network. On both, I am to play small files, like downloaded TV shows, but not full movies, 700MB+. Most of my files are .avi.
When the movies attempt to play I get an error msg saying that one or more files couldn’t be played.
I tested with another router, and the ALL files were able to play on the Win 7 machine, but not the 8.1.
Doe anyone have any other solutions I can try, be it on OSMC or Windows, or some networking mojo?

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