a problem on default font displayed when Linux system starts

my PC use redhat linux 9
when i installed a software i changed the path parameter PKG_CON_PATH
 when i restart the linux system the next, it displayed:
setting default font (latarcgheb-sun16): utf8 :no such file or
directory  [failed]
there is also error hint before startx, like this:
#utf8: uuuuuuuuuuuuuu
and when i got into gnome later, i can't open any file except Mozilla
Then i enter KDE, i can't open files named by chinese

next, i changed PKG_CON_PATH and let it equal the default directory:
#export PKG_CON_PATH=3D/usr/lib/pkgconfig

restart, there is still the same problem

what's wrong? how to deal with it ?