I gave up and reinstalled, seems to be working again now. Thanks to all who looked even if you didn't have any ideas.

Greetings, first post. Using FSX I have had no problem installing the MAIW sets I have downloaded. My problem does not really relate to MAIW any more than any other plane, it is to do with the ai sounds, I had successful been using Alan Constable's sound sets for all ai planes including the military ...