New fix released for Windows 7 SP1 0xC000009A language pack issue
Some of you hit the 0xC000009A exit code when installing Service Pack 1 for Windows 7/2008 R2 on systems where multiple language packs have been installed. This issue has now been resolved and is published here: https://support.microsoft.com/kb/2534366
Note, this fix must be installed on multi-langpacks system BEFORE installing Service Pack 1 to ensure that the multitude of servicing operations generated on these types of installations doesnt fail the service pack install.
--Joseph