This is taken from: http:https://www.x2b4.com/mark.ossdl.de/2009/08/change-mui-language-pack-in-windows-7-home-and-professional/ and merely rewritten for reference.
You will have to get the appropriate “lp.cab”, i.e. from the Language Pack DVD. Then, type this in a command prompt as Administrator (change path and language code appropriately):
dism /online /add-package /packagepath:<pathto/lp.cab>
bcdedit /set {current} locale en-US
bcdboot %WinDir% /l en-US
After that, remove the registry folder HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MUI\UILanguages\fr-FR.
Reboot.
If you get this error:
An error occured trying to open <pathto/lp.cab> Error:0×80070003 The System cannot find the path specified
copy the lp.cab to C:\ (the root directory) and run dism from there. Remember that the command line shell must be run as Administrator.
Fantastique, j’ai passé un bon moment à chercher comment mettre l’interface en français sur Windows ThinPC, et cette méthode en utilisant les lp.cab disponibles sur l’image multi language de WES posready7 marche à merveille !
Je n’ai eu qu’à généraliser la configuration depuis le gestionnaire de région du panneau de configuration.