If you are using ・Windows 　http://www.nihongomemo.com/pctips/ime.htm ・Mac 　http://redcocoon.org/cab/mysoft.html helps you. I think almost all Japanease use these software because these are installed with OS by default, and no Inconvenience.

Linux http://www.scim-im.org/

If you are using Windows, your computer should have the IME for Asian languages installed. Just use that.

Apple Tiger & Leopard OS X allows you to select it under Preferences > International > Input Menu. It's really easy and you can quickly change between languages with the shortcut key. よろしきおねがいします：）It's that simple...

why dont u try from the windows one...i mean from the control panel....that's good i think.. hehe i myself use that...