The keyboard!

Go to your regional settings, keyboard, and check if Google IME is under Japanese.

Also, retying the sentence to see what it does for me.
すまない・・・日本語が出来ないんですが、詳しく説明してください。

Edit: Holy crap, what? lol

Also, difference between Google IME and microsoft is that it recognizes words and names better with context. When you type out a whole sentence and hit enter at the end, all the kanji placed in should be what you were trying to get.

Also, names. Typing in れみり gives me レミリア・スカーレット automatically, saving me the time needed to type it.

Interesting. I wonder if the auto-search thingy (I forget what it's called) works in JMS. The thing where it starts searching for what you're looking for, even though you're not finished typing it.