Font Problem

[bunndoo]

PLEASE HELP ME TO SOLVE MY PROBLEM

PICTURE IN ATTACHMENT TELL EVERYTHING I HOPE.

IN BUTTONS I HAVE SQUARES INSTEAD LETTERS.
THATS HAPPENED IN ALL BUTTONS
AND SOME TEXT IN WINDOWS WHERE CAN BE OPTIONS FOR ADJUSTING OR SOMETHNG LIKE THAT.

WHICH FONT INTERFACE USE?
WHICH FONT BUTTON USE?
MAYBE THIS SOLVE THE PROBLEM IF I KNOW!
MY SYSTEM WIN2000,CROATIAN LANG,NVIDIA TITANIUM

SO MANY THANKS
MY EMAIL: bunndoo@hotmail.com or yahoo.com