Question: A frequently asked question by Multi-national Administrators is where could I get the MUI packages for Windows XP Service Pack 3?
Answer: You should use the same MUI package for Windows XP Service Pack 2 and install the following additional item:
942766 An update is available for the Multilingual User Interface Pack for Windows XP Service Pack 3, for SP3 for WEPOS and for SP3 for WinFLP
which has a link to the package below
Windows XP Service Pack 3 MUI Pack Update