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For download and install additional LIPs >
Control Panel > Regional and Language Options > Keyboards and Languages > "How can I install additional Languages?" > in Windows Help and Support: link "How do I get additional language files?":

Zitat

Windows Vista Language Interface Pack (LIP).‌ Windows Vista LIPs provide a translated version of the most widely used areas of the user interface. LIPs are freely available for download on the Microsoft website, and most LIPs can be installed and used on any edition of Windows Vista.