English/Japanese keybord - trouble

Hi - I hope it's the right newsgroup(?)
I use Windows Vista x64 (english).
I have an english/japanese keybord.
In "Regional and Language Options / Keyboards and Languages / Change
keyboards / " I have added "Japanese keyboard". (NOT Microsoft IME because I
don't want to write in Romaji)!
In "Control Panel / System / Device Manager" /Keybords " I have updated the
driver software by choosing "Japanese PS/2 Keyboard (106/109 Key)" - but
without succes.
My trouble now is:
When I press the key "a" I get "�", " s" => "ﾄ" and "d" => "ｼ".
The correct should be this: "a" => "�", "s" => "�" and "d" => "�".
Can somebody help to solve this problem"=
Steffen