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The first thing you need to do is create a folder in the location where you plan to move your My Documents folder. This is because when you ask
Windows 7 to move the folder, it actually is just moving the contents. Once you've done this, bring up the My Documents folder itself. Though there are numerous ways to get there, clicking on the Start Button and then clicking on Documents (as shown here) will take you to it. Along the left side of the window that opens, you'll see an item that says Libraries. You should see Documents listed underneath it. Beneath that should be listed the My Documents folder. If you don't see it, click on Libraries and then Documents to expand them, showing the folders they contain.
From here, you can right click on the Documents folder and choose Properties. You should be presented with a window similar to the second image here. You'll notice there are four tabs across the top. You want to

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click on the Locations tab. There is a button labeled "Move..." that enables you to move the contents of your My Documents folder to an alternate location.
When you click on this button, a window will pop open. Go to the new location where you want to place your My Documents folder. Choose the new folder you created previously and click on Select Folder. When you click Okay on the Properties window, you'll get a warning message like the one shown here. All this is telling you is that mov

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ing the files may take a while, depending on how much data there is to move. Once you click Yes, the data in the folder will be moved. And that's all there is to it.