That actually helped!
I do not understand exactly why but it works now.
I installed Korean and Japanese fonts. I choosed Meiryo for the stimuli and worked. This is strange for me because under Excel all the strings are corretly shown in Arial but not in psychopy using the same font.
Now the instructions are shown in Arial and the stimuli in Meiryo (Meiryo also work for latin instructions but they do not fit in the original place)
Thank you