Check with minimum system requirements on the side of the gamebox or if you get it online, check the website for Minimum System Requirements.
Your computer might not be compatible with the game you are trying to play.
Best of luck!
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Also... sorry I kind of read the question a bit too fast.
So you are saying that it won't let you DOWNLOAD it...
Check to see if your firewall is blocking it. I believe you can access that by going to Start>Control Panel>Security Center (Or Windows Firewall)