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Select the Local files tab and click the Verify integrity of game cache... button.
Steam will verify the game's files - this process may take several minutes.
Once the process is completed, the Check Window will automatically exit.
Important: One or more files may fail to verify.
This is normal for most Steam games. The files that fail to verify are local configuration files that should not be replaced as part of this process. You can safely ignore this message.
Do you have a valid copy of the game?
http://www.microsoft.com/en-us/download/details.aspx?id=35
I don't know if that'll work but it's worth a try.