yes, use the Japanese IME that comes with the winxp or vista or win7 here u go: http://www.japonin.com/lang-setup.php?os=xp

You could also use a IME that is inbedded into a website.. Some questions earlier I already mentioned the link but right now i do not remember. But it is fairly easy to find.. just google IME Japanese online .. or something like that and you will find it quickly.

the best way i think is just to use the language bar that comes with windows!

you may use your regular keyboard to input Chinese, Japanese and Korean. What you have to do is to install the software. Personally, I perfer NJstar Communicator, you may download it from the following link: http://www.njstar.com/cms/njstar-chinese-word-processor-download