Windows 7 Pro
While technically it is an upgrade, it is a valid license for Windows 7 pro. All you need to do is install the OS and not input the license key. Then you reinstall the OS and select upgrade. When it asks for the key input it now and it will activate. Technically this is cheating and not kosher, but it does work.
Edit....It looks like you already found your OS. I also missed the second page of this thread.
While technically it is an upgrade, it is a valid license for Windows 7 pro. All you need to do is install the OS and not input the license key. Then you reinstall the OS and select upgrade. When it asks for the key input it now and it will activate. Technically this is cheating and not kosher, but it does work.
Edit....It looks like you already found your OS. I also missed the second page of this thread.