Hasta La Motion!

This is the first time i have came across this problem. Im working on AE cs4 on vista 64 .And when i make a ram preview the audio plays back at double the speed. I have gone through the usual suspects ( creating a new file just with the audio, checking preferences, testing the file, different file formats– wav , aiff , even mp3 –) and there is no way i can spot the problem. The funny thing is that if i make an audio preview it goes at the right speed…. im completely clueless and on a tight death line.. Haven’t found anything on the web either..
Thanks in a advance