problem wih greek language

i have a problem with the greek language in bs player options->language
->greek i cannot see greek i see something with no sense, and alsoi cant read greek subtitles in a movie where i also see sentenses without sense and they are not greek.
does anyone know how to fix it??
Note: it worked perfect untili did a format in my pc but in word and other applications i have greek language and no problems.is it a problem with bs?should i update smth?