Multilingual User Interface (MUI) packs for Windows XP, which provide fully translated versions of Windows in 24 languages, are only available for download or for sale to companies that are part of a volume licensing program or who have Select and Enterprise agreements.Так что официально может и не получится скачать, но на трекерах MUI точно должны быть.
If you upgrade to Ultimate or Enterprise editions of Windows Vista or Windows 7, however, you can download full language packs for free. You can also get a Windows XP MUI pack if you request it on a new computer from the original manufacturer.