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FIRST:
MAKE SURE YOU COMPUTER HAS ASIAN LANGUAGES INSTALLED!
go to:
start->control panel-> Regional and language options::Languages tab
Check-Install files for east Asian languages
Click Apply and install (may need windows CD)
Click NO to reboot
Then go to Advanced tab and check Japanese
Reboot

NEXT:
Download and install the game here(keep clicking next on installer):
http://www.cabal.jp/file_count.ashx?num=41943058
Create an account here(guide: http://img451.imageshack.us/img451/8836/cabaljpnregguideej9.gif):
https://www.gamepot.co.jp/gic/regist/cabal/new_form.aspx

Run the cabal updater and update the game....
Now you have the ability to play in japan... now to make the client English..

English file and instructions here:
http://www.cabaldatabase.com/RVNG/ToEng.rar

ps
not really an exploit but a usefull piece of info most of the english community are on the mercury server (i really hope i still get premium for this *fingers crossed*