uhh.. I'm at work now, I don't have the program here, but there should be a button in the control panel which let's you separately choose the video, audio and subtitle file (open in .ini or something.. damn I don't remember 🙁). You propably have video & audio in same .avi file so just push cancel when it asks about the audio. If the sub's don't show up, you have to turn them on -- again, don't remember exactly where the button was..
I hope that helped 😕 😀