Alright, so I'm typing in Japanese for schoolwork, but apparently everything but the letters and numbers is mapped differently when I'm using Microsoft IME.
I had a similar problem come up just yesterday, maybe my fix will work for you?
Tell it to Show the language bar, so that you have it going across the top of your window. Change to JPN to display the big list of options (Japanese, IME, Input Mode, etc.) on the far right will be CAPS and KANA buttons stacked one over the other. try adjusting those to see if they will change your keys back to normal. For me, "normal" is both buttons being white. When you activate them they change to blue.
I think we were having the same problem, here's a better description of mine for...