One word: Steam. Suggest you check out Desertstriker's tutorials on YouTube about installing and modding the Steam version. It requires special handling.
Or, you could just spend $10 and get the publisher's version. It's available from numerous sources on-line, both DVD and download. Then you won't have to deal with any Steam-related quirks.
Steam may be a fine source for a lot of games, but if you scan the threads at SubSim, you'll find that a large proportion of the posts requesting help with a problem installation include the words "I have the Steam version...."
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