i purchased call of duty world at war off this website http://www.onlinekeystore.com/call-of-duty-world-at-war-digital-download-direct-download.html and it only lets me play Multiplayer when i try play single player or co-op its gives me a error saying "please insert the correct DVD-ROM, select OK and restart application" but i got the game off the website and dont have a disc 
HELP!!
HELP!!
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