if u r using windows 2k, windows xp, windows 2003
u could install the IME editor from "control panel" -> "Regional and language options"
choose "Languages" tab and then "Install files for east filter-074 languages"
once finish, reboot ur system
then go to control panel -> regioanl and language optiosn, choose languages tab
click on details under text services and input languages frame,
choose "add" under install services frame
choose input language = japanese
and choose ur keyboard layout/IME method.