I had previously installed the pre-released version of Windows 10 on an Acer Aspire One D255E that was previously running Windows 7 Starter, it was working fine. Then after July 29 I downloaded the release ISO file and burned it to a DVD. I installed the released version of Windows 10, and formatted the drive before installing so it would be a "clean" install. When trying to activate Windows 10, it will not take my Windows 7 Starter code key, so I tried using a "Windows 7 Home Premium" copy of windows I had from a laptop I am no longer using and it is not in use right now. It won't take that code key either. How do I get a proper activation key for Windows 10?