How can I transfer my gamer tag from xbox 360 to PC?

how can I transfer my gamer tag and games saves from xbox 360 to PC ?then can I use them to play modern warfare 2 in PC ? coz I want to use my weapons in multiplayer.How can I transfer my gamer tag from xbox 360 to PC?That is not possible. Nor is transferring any save progress you made on the 360 version. If you choose to start a new game on the PC version, you will do just that.. Start all over.

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