Avermedia is a company, their software for their capture cards does hook directx even though its not needed with a capture card which causes that behavior. If you don't know it you probably don't have it on your PC.
If you have downloaded the game from steam, but you have not started it, you have to start it and open both the multiplayer and the zombies mode so that both modes can be downloaded, and then open the plutonium, i think.
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