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Question: comp. access to video files thru my sony smpn100 media player

I have the sony smpn100 media player connected to my tv..a netgear wndr3400 dual band router and a wd 1.5tb external hard drive connected to my computer. The media player is set up and has a connection to the computer. I need to know how to access my video and music files on my computer and watch them wirelessly on my tv...is there any other equipment I need? Thanks