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Can you ensure that you're running the game as an Administrator?
On Windows 7 and Vista you can check that the game has administrator privileges, by right clicking on the shortcut to the game and choosing Properties. Then choose the Compatibility tab, and finally choose Run this Program as an Administrator.
OK this screen, then try the game again.
If that doesn't help, make sure your Internet Explorer installation is working correctly and isn't set to Offline mode, and that you have the latest Windows updates from here:
I just encountered this error, be sure to also disable any proxies enabled in internet explorer! This is fixed it for me.
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