Most of the time it is not the hardware that makes the problem but the file it self. Try to time when a word is said and the image that has to be with it appears. Close the program start it up again and see if the time is the same for the word and image. If the times are the same it has to do something the file. If the times are different it has to do with the hardware.
It also makes a difference if you are playing it from cd or from HDD. Cd is most of the time a little slower so try to always watch it from HDD accept for dvds .

Hoop it works out.