You will need to have X-box Live to do so. You can then go to the store and enter the code on X-box live from a point card or buy them directly from X-box Live.
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No. You earn gamer points playing games, Microsoft points are to buy things on the xbox live market place.
1600 Microsoft points.
you can get it from target even microsoft points!
Points vary on what theme you are wanting. Maybe 80-300 points.
you need to have xbox live and buy it with your Microsoft points