I found a solution for your problem, i had the same problem but with a different language, Italian.
go to Control Panel
then click on Clock, Language, and Region
then click on Region
if you see the first line in Formats tab is
"Format: English(United States)"
then your are good
click on Location tab, and change Home location to united state
now click on Administrative tab
click on the first button "Copy settings..."
now u will see in "current user" your preferred language, which is English
check the two check-boxes at the bottom and click OK, this will change the Welcome screen and New user accounts to your Current user's settings.
your PC will tell you it need a restart, click no or later.
click on the second button "Change system locale". change the Current system locale to "English (United States)"
now restart your PC and enjoy an full English version of windows 8
this helped me get rid of the Italian language at the welcome screen, not sure English will still be the default language after you refresh your PC.
It depends on your Office version. With an Office 365 license that has received Office 2016 you can change the language.
Go File > Options > Language and click on "How do I get more Display and Help Languages".
You may need to download some files to do that. The "how to" link gets you to this page.
With older versions of Office you may need to install the localised language version, and that may not be a free download.
Best Answer
You cannot change the language of the windows installer. You need to download an English version of Windows 10 ISO.
You can download it from Microsoft by using the media creation tool which can be found here. Download and run the tool. Follow the on screen instructions.