After attempting to install Halo 1 and Halo 2 on a different computer for the second time, I was told that my product key was invalid. I've read that Halo 1 product key has an unlimited amount of uses and I'm not sure about Halo 2, but I should be able to at least install it twice. I can't play multiplayer with the current product key I have for Halo 2 and have even contemplated buying a whole new game for just the product key to resolve the issue, even though I haven't.
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My Halo 2 Vista key has only been redeemed once, I believe. PM me and I can give it to you to try.
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The servers for halo2 MP and im pretty sure halo CE MP were both shut down months ago.... no amount of product keys are going to solve this.
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How is it living under a rock? BUNGIE no longer has rights to halo You would have better luck at halo waypoint