not sure if this will be of use to anyone, but here are the instructions to changing the system locale with screenshots attached. This is only for Windows 7 and onwards.
When planning to install any game that is has not been localized make sure that you change system local to the appropriate region. Do not just change the display language, that has NOTHING to do with running the game properly.
go to control panel > under: Clock, Language, and Region > Change date....or number formats
select Administrative tab
under Administrative tab: Change system locale...
under Current system locale: change whatever region you currently have to Japanese
click OK, make sure YOU RESTART RIGHT AFTER BEFORE CONTINUING INSTALLATION.
if you have any further questions, feel free to ask. Hope this helps.