kdl40nx720 subs and video

hallo, i am new here i was using windows media for dlna but some large files .avi and some HD didnt even apear on the list of movies.
then i installed serviio and apear and playing with a little delay probably cause of my old pc , but now the old movies dont even show the subittles which are embeded with aviaddsubs program, and also from full screen now only shows them in the 1/3 of the screen. what can i do fix the full screen and see the subtitles i tryed almost all , (same folder same name subs) (embed subs) (-eng sub) nothing changed..
thanks alot.
then i installed serviio and apear and playing with a little delay probably cause of my old pc , but now the old movies dont even show the subittles which are embeded with aviaddsubs program, and also from full screen now only shows them in the 1/3 of the screen. what can i do fix the full screen and see the subtitles i tryed almost all , (same folder same name subs) (embed subs) (-eng sub) nothing changed..
thanks alot.