mmm well what i did was just install a japanese font into my comp... if u have windows XP take out the windows xp cd and put it in, then access your language and regional settings options in the control panel, and add japanese from the list in one of the tabs there. ater this i think u'll have to reboot and then ull get a nice lil language4 bar letting u change what u type from english to japanese :3 then when u wat to insert the kanji, type the hirigana for it, press space, and then select the right kanji from the list
hope that helps :3 hah, although if u dont have windows xp then i cant help ya lol :/