Copy a DVD in Windows 7
There is no built-in tool to copy DVDs in Windows 7. You will need to install a third-party tool, such as Handbrake.
UPDATE: As mentioned by others, Handbrake is not ideally suited for DVD copying, but it will work. DVDShrink or DVD Decrypter (or numerous other newer DVD copying applications) will work as well. It stands, though, that this functionality is not built into Windows.
My favorite is DVD Shrink. The current version is available at http://www.softpedia.com/get/CD-DVD-Tools/CD-DVD-Rip-Other-Tools/DVD-Shrink.shtml