My computer is DELL Inspiron 7447 (for more information: http://www.dell.com/th/p/inspiron-14-7447-laptop/pd)
My windows is Windows 8.1 Single Language (OEM Version). And, since July 29, 2015, the icon GWX on the notification area was disappeared but my reservation in the Windows Update page still there.
I have installed Windows 10 using Media Creation Tool x64 for several times. Everything is fine until 22% of installation process ( After I choose what I keep and click "install"). I don't know why it has failed but I think I don't have enough space? After, the system downloaded the file for installation, there s around 8GB left of the C:/ but the installer didn't warn anything about it (At first, there is only 600MB and the installer warned me that it doesn't enough.)
Thanks for you help.