Gday fellow simmers im new to forums so please forgive any mistakes,ive tried using proper channels, but as i purchased a boxed version i cant get info. would like to know what fsuipc4 is & is it req for proper instaall of cs 727 captain as i have problems with sound eg sounds like a car radio thats not tuned properly &has that whisling sound as the engine is rexved apart from the sound problem everything works fine i have vista & fsx acceleration i have 5 addons that i have no probs with, the reason im asking about fsuipc4 is when instlling the 727 it said fsuipc4 has stopped working im pretty sure i dont have it on my computer any help please