Changing Windows display language from Japanese to English

Question

So I changed my laptop's language to be in Japanese in order to use a program called UTAU (if you don't know what UTAU is, it is a Japanese singing synthesizer application that's similar to the Vocaloid software).

I did this because I saw it in a tutorial video from YouTube. I then decided that it was too much work for me to use the program, at least for now, so I deleted it and changed most of my system back to English, but for some reason the date on the welcome screen is stuck in Japanese.

I went to Region > Administrative > Copy settings and saw that it was set to Japanese for Welcome screen and New user accounts. I can't find a way to change it back.

I feel like I've tried everything. I looked up this issue on Google and I kept seeing the "override for windows display language" option pop up a lot in the search results, but I can't find this option on my laptop. Does anybody have an idea for what I can do to change it back to English?

My laptop is a Windows 10 Home Version 1803 Acer Aspire E15, for those who were wondering.

Here is a screenshot of what I'm talking about:

Answer 1

The "Copy settings" window is literally how you change these values.

Your own settings under "Current user" are already in English (US). Therefore it should be enough to select both checkboxes under "Copy your current settings to..." and confirm with 'OK'.

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If this doesn't work, the "Welcome Screen" settings are at HKEY_USERS\.DEFAULT in the Registry. It should be possible to export your settings from HKEY_CURRENT_USER\Control Panel\International into a .reg file using RegEdit, edit the file to replace HKEY_CURRENT_USER with HKEY_USERS\.DEFAULT, and import it again.

To do the same for "New user accounts", it is necessary to "load" C:\Users\Default\NTUSER.DAT through RegEdit first.

Some examples can be found in this Technet thread.