Microsoft does only allow to change the system language of Windows for Windows 7 Enterprise and Ultimate via the GUI. If you would like to change the language in Windows 7 Home and Professional you need to do that manually as described below (as a sample I describe how to change the language from English to German):
- Download the desired language pack. You find a complete link list here on this site. For German and English I copy them below:
- Download the exe2cab tool to convert the EXE file into a Microsoft CAB file.
- Open a command prompt (as an Administrator!) and run the following commands
- You then need to delete the following key from the registry:
- Reboot your machine
If you would like to change your language to or from another language you need to adapt the locale strings (like "de-DE" and "en-US" etc.) accordingly. A list of all strings can be found here.
Thank you to Tobias Hartmann!