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Your motherboard is more than seven years old and is not supported on Windows 10.
Your processor is also not supported on Windows 10:
If you really want to stay with this hardware, which I do not recommend, you may still be able to get a copy of Windows 7 that you can download from Microsoft using your windows 7 product key.
It is unlikely that you could simply move your existing hard drive to your new motherboard and expect a successful Windows 7 boot, so I would recommend that you reinstall Windows 7.