Workaround to Change System Display Language When Vista MUI Install Tool Fails

Non Ultimate edition Windows Vista users can now use Windows Vista MUI Tool to install additional language packs or MUI packages into system so that the system can display in another locale language other than default installed language. As non-supported Vista also does not provide any user interface to change language format, Vista MUI Multi-Languages Package Installation Tools also provides a way to change the default display language.

However, users requires to log on as administrator user and disable UAC in order change the language of the system. Even when users are doing so, the language switching process may still fail, and users will be unable to select the just new language set. In some cases, the Apply button to make the new language in effect remains disabled or grayed out, or click without effect.

It’s possible to solve the issue by simply logout and login again using administrator user account, and with UAC turned off. However, if it still doesn’t work, try the following trick to modify system language directly in registry.

  1. Run Registry Editor (regedit.exe).
  2. Navigate to the following registry key:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MUI\UILanguages\xx-YY

    where xx-YY is the original system user interface language locale string, such as en-US for English edition.

  3. Rename the xx-YY to aa-BB, where aa-BB is the locale string for the new system language that you want to set (such as de-DE for German), so that the registry key looks like below:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MUI\UILanguages\aa-BB

  4. Inside the renamed aa-BB registry key, create a new “String” value in the right pane, and name the new value data as DefaultFallback.
  5. Assign the “DefaultFallback” with value of xx-YY (the original language).

3 Responses to “Workaround to Change System Display Language When Vista MUI Install Tool Fails”

  1. Download Windows Vista SP2 x86 and x64 Language Packs (MUI LIP) » My Digital Life
    July 6th, 2009 02:02
    3

    [...] Premium or Home Basic users, the LIP can be installed using MUI Install Tool or follow the guide to hack install LIP [...]

  2. FUsion
    December 15th, 2008 01:45
    2

    Same for me!

    Trying to get Vista back to normal now.. any tips?

  3. atipatt
    June 4th, 2008 08:47
    1

    Hi

    I tried everything but still no luck. I followed the steps, then regedit.. vista became slow, start menu not operable, sidebar does not work, etc,etc , so.. I installed the Vista again :( New update on this, anyone? Thanks,

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