Cannot see pictures and cannot hear audio on Galaxy Y; package data not signed properly

Question

I don't know what's wrong with my Galaxy Y. When I take pictures or download pictures, they cannot be viewed. Audios can not be played. I tried downloading Facebook, Viber and Wattpad, but it keeps on saying package data was not signed properly.

Answer 1

Actually galaxy y default player doesn't support much formats. Check which format it is. Then try downloading the player which supports the format.For eg: if it is 3gp format videos you will need 3gp player.