gistfile1.txt

1. Force System Language via PowerShell

Run PowerShell as Administrator and execute:

# Set system display language to Polish
Set-WinSystemLocale pl-PL
Set-WinUILanguageOverride pl-PL
Set-WinUserLanguageList pl-PL -Force
Set-Culture pl-PL
Set-WinHomeLocation -GeoId 191  # 191 = Poland


Then reboot.
This forces all accounts + system services to use Polish.

2. Check Registry (if still English)

Sometimes the UI language override is stuck in registry.

Press Win + R, type regedit, go to:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MUI\UILanguages


You should see subkeys like en-US and pl-PL.
👉 If en-US is still present, Windows may fall back to it. You can:

Make sure pl-PL exists and has values.

If you’re brave, back up the key and delete en-US. (That’s the nuclear option, but it works if you really want English gone.)




# Reset Settings app
Get-AppxPackage *windows.immersivecontrolpanel* | Reset-AppxPackage

# Reset Windows Hello / PIN dialog
Get-AppxPackage *cred* | Reset-AppxPackage







# Reinstall Polish language experience
Get-AppxPackage -AllUsers *LanguageExperiencePackpl-PL* | Remove-AppxPackage -AllUsers
Add-AppxPackage -Register -DisableDevelopmentMode "C:\Windows\SystemApps\LanguageExperiencePackpl-PL*\AppxManifest.xml"