My computer won't recognize my mp3 anymore?

We just re-installed everyting on my computer and now when I plug my mp3 in it won't even recognize it. I tried installing a disk that my mp3 came with and that worked but even the program that came with the mp3 won't read it, and neither will Windows Media Player. Any clue what to do? Can I manually set up my mp3 to the computer? It always use to work on my computer but now it doesn't recognize it..

Update:

I have a Samsung S3

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