No audio detection in Power Producer Gold

I have just changed my DVD writer to LG GH22 which came with a disc including power producer and powerDVD plus Nero Express and inCD
I had previously used an earlier version of powerDVD & Director with no problem.
What I am getting with the new software is a well produced video with no sound. I have ruled out the discs and the new player so it has to be either a PC setting or software problem. I use cyberlink power link express which came with the JVC camcorder again with no problem.
The problem appears to be with power producer, even the previews do not detect sound.
I know others have experienced this problem but as yet I have not seen a recommended solution.
I am not technical so any replies in plain English please :)