Kindle Fire Hd Videos Are Not Playing?!

Hello, I have a kindle fire hd. Its not the newest one it is just a regular kindle fire hd. I have been noticing when I have been going on instagram the videos were NOT playing. Also on silk ( web engine ), the videos were not playing either. I finally fully noticed and tested it by going to Personal Videos and tried playing one and it said Unable To Play Video. I was shocked and worried and I have gone online for answers but got none. Someone please help, all the videos in my Personal Videos are recorded by me and I really would like to keep them becaise they are from when I was younger. Does anyone know how to fix this?

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