I can´t see the letters ?„ ?? ˇ What can I do?

Hello I am from Argentine, my languaje is Spanish, and when I try to see subtitles that have the letters:
- ?„
- ??
- ˇ

On the screen I see something like ^
I try to cnage the Type of letter and I put Oriental, Occidental, etc but the problem don't disapeare.

What can I do??
Thank's
Adrian