To redeem prepaid codes on your Xbox 360 and PS3 console

1. Turn on your Xbox 360 console, and then press the Guide button on your controller.
2. Go to the 
Marketplace area, and then select Redeem Code.
3. Enter the 25-character prepaid code.
4. Confirm the item.
5. The item is purchased and will be downloaded to your console automatically.

First of all Open this tool Then Click on Install.After it finish then Restart your computer.