Wont play MP4 videos

Some one installed 2.2.1 and then installed 2.4.6 on the computer,  when using the 2.4.6 and trying to import media as a MP4 it wont play. I have installed the program at home on my computer to play with and noticed when it comes to importing it says the types of files it can open but on the church computer it doesn't show the same thing. any help would be great. Im not real computer smart.


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