I tried VLC but it just showed a black screen back when it didn't worked but now it works actually.
I don't know what happened...
And also, videos that didn't work used to work before...
EDIT: Ok, I found the problem, Windows media players don't like to use my Nvidia Geforce 760M, it has to use my Intel graphics card to work
The problem was probably caused by me messing with things in Nvidia control panel
Anyway, not the first problem I have with a mobile GeForce, will buy a desktop PC next time.