yeah, IME is all that's needed..
you can fix this in the control panel of your computer, add a language (in this case JAPANESE).
then you have that "language icon" (blue square to the far right) in the task bar. click it, choose ja (japanese), then a new set of icons appear, amongst them an A click it and change it into "hiragana" or something (i think that's the best option).
Now you can write in japanese, just by writing with your normal keyboard. for example Yume (dream). just write it as you write it with normal letters: Y u m and e:
???that's what you get
now, if you write like this, you will have to use the enter(return)-key before you make a space, because it's underlined and can be changed with the space bar into kanji or katakana (or back to hiragana again).
??now you may get the kanji like this...
was that something like what you wanted?
You can also get a "on screen keyboard" with japanese characters, amongst those icons where the A was..
Now you press that little bucket instead, and choose IME Pad ?Soft Keyboard? Then you have to click the small drop down button to the left, ?Next to the 1)?and change layout to Japanese?
I hope this helps