In your Windows Explorer, right-click on your downloaded "jdev_suite_121200_win64.exe" file and select "Run as administrator".
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Actually we just recognized that there is a problem with the 64 bit installer on Windows7 and 8 (and I am filing this as a bug today). To work around this, execute it as administrator, as mentioned by user13342668. This can be done using the right mouse button, or by invoking the executable from a command prompt you opened in administrator mode