There are several places on this site where we use Japanese characters.
They might not show up properly; if this is the case, Windows XP users can
probably solve the problem by installing the Asian character sets:
Start -> Settings -> Control Panel
choose 'Regional and Language Options'
select 'Languages' tab
under 'Supplemental languages support', check 'Install files for'
Windows 8.1 users, go to Control Panel
select 'Add a Language'
From the list of supported languages, click 'Japanese'
close window. exit Control Panel
you will then need to restart your computer.
The details may vary from version to version of Windows, so take the above
as a general approach and modify it for your system if necessary.