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I am using English version of windows. I just wanted to google something in Japanese. So I installed the Japanese input method. All went fine. After that I found that the display language of windows changed to Japanese! And I have to set the display language setting back to English and restart the windows...
Anything that is unrelated to elephants is irrelephant Anonymous - The problem with quotes on the internet is that you can never tell if they're genuine Winston Churchill, 1944 - Never argue with a fool. Onlookers may not be able to tell the difference. Mark Twain
So to be fair...
1. Any modern operating system is a very complex beast.
2. Making all of the bits and pieces work together correctly is a very large task. Realistically it is simply not possible for some cases due to complexity.
3. Many users of Japanese might in fact want to use english but the reverse is probably much less likely to happen.
4. And Microsoft is out to make money.
Consequently many, many things that individuals might want to do requires that those individuals find specific ways to do it because no OS can meet the goals of every single individual.