IME stands for Input Method Editor.
This is a program that allows you to enter characters or symbols that are not present on your keyboard.
Google Japanese Input should work on the following Operating Systems:
Windows 32/x64 (8 /7 / Vista SP1 / XP SP2)
Now for the actual installing:
When installed you can type Japanese by first pressing Alt + ` (The button above Tab).
Then if you type for instance "ha" you get "は". If you practice typing it should quickly become no problem to type Japanese.
You can convert kana to kanji by pressing "Space" and then select which you want to use.
Maybe if i'm bored sometimes i'll write how to install the Microsoft IME, but for now you can install that using this as a guide:
It is also very helpful to get a Japanese keyboard!
I easily found one on amazon for £12 and it has been very very useful.
This is really useful. But I do not know how to type the characters for "Dji" and "Dzu" . Can someone tell me ?