BEFORE INSTALLING:
Kaizuto, have you changed your system locale from English to Japanese?
To do that, go to Control Panel -> Clock, Language, and Region -> Regional and Language Options -> Administrative -> Change system locale... -> look for the Japanese (Japan). Doing so should require you to restart your computer for it to take effect.
To be able to see Japanese characters, you can also go to Control Panel -> Clock, Language, and Region -> Regional and Language Options -> Keyboards and Languages -> change keyboards -> General (tab). Then click on "Add..." and look for Japanese. Then make sure to check Japanese and Microsoft IME. You can also check the Ink Correction box if you're using 64-bit Windows.
After you've done those things, you should be able to install normally.
