It is hard to find in the Windows MUI Knowledge Center for which Windows 7 editions you can change the language. Only when you carefully read Language Packs in Windows 7, you see a table with “Availability and usage” indicating how you can get language packs. To summarize, Complete language packs are only available for:
- Ultimate Edition
- MSDN subscribers
- Registered OEMs
- Enterprises
- Server
Virtually all UI languages are complete language packs as shown in the table under Available Language Packs.
In other words: you cannot change the UI language in Windows 7 professional as this post phrases in a much simpler way:
Unfortunately, the Multilingual User Interface (MUI) Language Packs will only work in Windows 7 Ultimate or Enterprise editions.
So of all Windows 7 Editions, only Ultimate and Enterprise allow you to change the language.
Bummer, as for all Windows 8 editions (same for 8.1 and up) allow you to change the UI language.
–jeroen
via:
The Wiert Corner - irregular stream of stuff 