Wrong files being played.. No AVI support

Hi, so i recently did a fresh install to 7057 x64. After i installed i gave myself access to one of my partitions that had all my movies and music on it. For some reason every time i try to play a song windows media player will say the right name and such but it will be the wrong song.. Also i can install K lite codec but it after its done installing i cannot play AVI file types. Im not sure what im doing wrong. Maybe someone can shed some light? thanks

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