41fb3f57__Packs_in_Win_XP_and_Win_Vista__1
[0] . [3] For non Win Vista Ultimate, Vista Enterprise installations: Only single language installation. For these editions, Windows will automatically remove all non-default languages from the computer after the end user completes the Windows Welcome. [1] 
Licensing requirements
Creative Tester: Uncovering Myths about Globalization testing- MUI Packs in Win XP and Win Vista
1