I can't get Monafont to work

I bought some new hardware and decided to install Vista along with it. I Installed Monafont (I can see it in the Windows Font folder) but as far as I can tell it won't work in Firefox - all SJIS Art seems slightly off. Compare



 　 ∧＿∧　　　∧＿∧　　　∧＿∧　　 ∧＿∧　 　 　　∧＿∧
　（　・∀・） 　 （　｀ー´）　　（　´∀｀）　 （　ﾟ ∀ﾟ ）　　　 （　＾∀＾）
　（　　　　つ┳∪━━∪━∪━━∪━∪━∪━┳⊂　 　 　つ
　｜ ｜　|　 ┃       Have fun with Ascii Art!        ┃　｜ ｜ ｜
　（_＿）＿） ┻━━━━━━━━━━━━━━┻　（_＿）＿）　　　　　Thank you.

to what I see: http://img214.imageshack.us/img214/4259/sjiszi0.png

/SJIS/ can't nigger-force.
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