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One of the most common causes for Windows 7 waking up by itself is that the setting for your NIC to wake the computer is turned on by default. You've probably already checked this, but it's worth mentioning just in case someone else finds their way here looking for the same problem.
Go to the Device Manager console and open the properties for your NIC, then choose the Power Management tab and be sure the box labelled, 'Allow this device to wake the computer' is unchecked. For me, it was the wired Ethernet card, but a wireless card may also do it. I'm not sure.
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