Where do you get this output, it looks niiiice
Seriously, you are in Linux console when you see that ?
If yes, try:
Then re-try a ls
If it does not output correctly the file names, try another font in:
/usr/share/kbd/consolefonts
(There is a README.Greek in this dir as well)
Once you find a good font, add it in /etc/rc.d/rc.font and make sure it is executable so it will be executed at boot process