I can't write on the search of yahoo or any other pages or read emails in greek even when i unistall and go back to internet explorer 6 , with firefox i am ok,but i use internet explorer most of the times,i got windows xp greek edition anyone have an answer for me plz

This is what i get when i try to write in greek

±ΕΔΏ µ΄Ώ ΔΏ ΐΑ±Ό± Γ±½ Ή µΑΏ³»ΕΖΉΊ±

I recently installed a modified version of Windows XP (specifically windows xp performance edition feb 2008) but the Greek language to use for my keyboard isn't there in the list of languages to pick from..

Where can I get it and how do I put it?
I want to type greek.