japanese languagepack, vista

I can't seem to install the japanese languagepack. I've found it in windows updater, downloaded and rebooted. But the japanese characters won't show in menues and such.
I can't use applocale for viewing japanese text and I can't set my systemlanguage to japanese (tried and had to repair using vista dvd).

I did try to remove it and reinstall it, without any success. Any ideas? Should I just emulate/dualboot with xp for this?

use a mac, all language troubles are solved.