How to change xbox 360 live membership from gold to silver?

Kristyn asked:


I had a free trial of an xbox 360 live gold membership. Now, the trial ran out, but I still want to get on the gamertag because I have save files from my games on there. When I try to log-in it just tells me that it's not a valid xbox live membership. How do I change it from gold to silver so that I can play again?

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