##Edit three variable to fit with yours.
$InstallLanguage = '0409'
$Default = '1033'
$LanguageFlag = 'en-us'
##Revert to original language
reg delete HKLM\SYSTEM\CurrentControlSet\Control\Nls\Language /v InstallLanguage /f
reg delete HKLM\SYSTEM\CurrentControlSet\Control\Nls\Language /v Default /f
reg add HKLM\SYSTEM\CurrentControlSet\Control\Nls\Language /v InstallLanguage /t REG_SZ /d $InstallLanguage /f
reg add HKLM\SYSTEM\CurrentControlSet\Control\Nls\Language /v Default /t REG_SZ /d $Default /f
powershell.exe Set-WinUILanguageOverride -Language $LanguageFlag
powershell.exe Set-WinUserLanguageList $LanguageFlag -Force
