Hello, Recently I unsuccessfully tried to upgrade my Windows 8.1 to Windows 10 (the process froze at 32%/6%), and now I'm thinking about performing Windows 8.1 reset / refresh first and re-try upgrading to Windows 10 after that. My problem is: when I bought my Desktop PC (a HP) it came with the pre-installed one-language Windows 8.1 Home edition. I upgraded it to Windows 8.1 Pro immediately after the purchase. Now my question is: will my system be reduced to a 'Home one language' state after I reset / refresh it or I will keep Windows 8.1 Pro? If the system is reverted back to 'Home one language', how can I restore my upgrade? I have the upgrade product key; I tried to download Windows 8.1 ISO using this key but MS refused saying it's an upgrade key and cannot be used to install Windows 8.1.