Problems playing an announcement video

Our Hispanic Minitry got the oportunity to move into the same building as the American Ministry. The problem is that the operating system of their computer as well as the version of OpenLP are old. (Windows xp + OpenLP 2.0) While we work on upgrading the equipment, we are trying to show edited announcement videos on the actual system but the portion where the person talks and gives the information doesn't show. Only the transitions, credits and effects show. I first saved it in as an .mp4 format and it didn't work. I tried .mvw but still it doesn't work. It either freezes up or that portion comes out black. What can it be? 

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