I'm having the same problem with Windows 7 and RCv4. It gives me the error message when I clik the speaker icon in the general options menu next to the airline name box. Please help!
I just installed FSX the other day and noticed that the Maule, Grumman Goose and possibly a couple other default aircraft are not available for me to fly in the sim. I also have not been able to get any add-on aircraft to show up in the select aircraft menu. Any help would be appreciated. Thanks\