same useful tips about installing the japanese language pack on win7 keeping you language at the same time:
If you have an ultimate windows, just installe the japanese language pack and another one you know (you'll understand later), but wait before switching the interface language;
in case you have samething different from the ultimate use this method:
-Set windows update to manual download.
-Uninstall KB971033
-On next windows update uncheck KB971033 and with right-click hide it; it wont bother you anymore even if you put windows update in automatic mode; this method also allow to keep windows update in automatic with a irregular install.
-Get Vistalizator, japanese language, english and/or your language, install them with vistalizator but dont switch the UI language, link is here
http://www.froggie.sk/
Now we get on the critical part; messing up with windows 7 system files always cause trouble, so:
-go in the system restore panel, configure your c: and choose "Restore system settings and previous files" , then increase the max usage to 50% or more.
-Optional: delete all restore points
-Create a new restore point, this will repair everything if windows update won't work anymore.
-Unhide system and protected files from folder options, at least until you finished.
-Check inside c:\windows\ and c:\windows\system32 for the mui folders, es ja-jP for japanese, then en-US , and additional languages, like it-IT;
those two are the most important but with a search you find a lot of them, for a daily usage i suggest to find and fix all of them, and there are same in Program Files too and c:\boot\ .
-Own all ja-Jp folders, this mean to change the permissions: you have to change the owner and give full access to all listed users; if you plan to delete the folders, only get the required permission and save same time.
-Choose your method, delete all ja-jP folders or overwrite the files with the same folders of another language; i suspect that the simple delete will broke windows update.
-Finally change the UI language and reboot; 95% of your japanese windows will have the original language or the one you overwrote the files from;
-Enjoy your games without using any noregion or ntlea
same notes:
Same programs will change the language to japanese, on most of them you have to deal with their specific mui files (just find them where the program is installed and delete/rename the jp related folders/files);
For ati panel regedit to hklm\Software\Ati\Ace\languagess and delete/rename JA; for Realtek audio i cannot find a solution for now.
ps: i tried to build a modified language pack but failed because of certifications that in win7 are a continuos pain; can't tell if one day ill get it working.