Change Display Language in Windows 7 Home premium

The en-US MUI within Windows 7 has multi-language tablet pc input disabled when you get non Ultimate and Enterprise editions of Windows 7. However, you can overwrite the en-US language pack or use any language pack provided for Ultimate/Enterprise to enable this functionality. Any language pack you download from Microsoft Update will work since the language packs are designed to be used with Windows 7 Ultimate/Enterprise.

Reference: http://windows.microsoft.com/en-US/w…other-language

Win 7 MUI Packs from Vistalizator:
32 bit
64 bit

Vistalizator 
Download link: http://www.froggie.sk/download.html

1. Download the exe language pack from http://www.froggie.sk/download.html, run the exe and it will extract “lp.cab” for a moment, but will delete it automatically. You will need to either rename it or move it as soon as it appears. This is the CAB file you need for the next step.


2. Run CMD as administrator and type:
DISM /Online /Add-Package /PackagePath:(path to lp)


Example:
DISM /Online /Add-Package /PackagePath:(C:\lp1.exe)

Then:bcdedit /set {current} locale (your locale)

Example:
your locale: tr-tr (or whatever language)


And:
bcdboot %WinDir% /l (your locale)

3. Then in registry:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlMUIUILanguages
remove key en-US

4. Reboot and it's done :)