Brand new to Linux, need some help getting started...

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http://www.linuxquestions.org – OK, I am new to Linux, so I decided to take an old computer I managed to score from an office that was down-sizing, and installed Mandriva One 2010 on it. So far I'm loving it, but I have a few problems I'm trying to work out. 1. My music won't play. I have my music on an external HDD, and when I click on a song to play it, an error box pops up that says internal data flow error. Same goes for videos. 2. I checked the box to not use 3D desktop effects, but I would like to go back now and turn them on. How can I do that without having to go through installing the entire OS again? 3. How do I download and install programs? (I'm wanting Banshee) (HowTos)