how can i install my copy of

how can i install my copy of MW2 on my laptop, i have the system requirement needed, and i just bought the laptop recently running on W7. i've intalled it previously on my desktop, but i already sell that and he reformatted it already. i still have the original installer, the 2 dvd box set with key. i tried to install it, but it says that i already used the said account. could you help me on this. thanks.

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