OK, your OS looks like it's in Japanese and you also have the fonts... did you also set the Language for non-Unicode programs to Japanese? if not, do so. then restart, and try again.
Applocale does this on a per-software basis and it works 99% of the time, but in the case that it doesn't, you need to change the global setting. (control panel / region&language / administrative / 2nd thing there -> set to jap)
in case you have already done this already, or after you do this it still looks weird, the installer is most likely corrupt. or something. xD