Audio Rendering Popping Noise

Hi, Finally getting to try the rendering part of the program(AE7 pro), and while the video portion comes out fine, the audio render is introducing a popping noise making it sound like a scratched vinyl record. The noise does not occur with a ram render. I've tried from 44100khz to 48000khz, uncompressed avi, in the settings but the noise is still occurring. I'll be finishing the project in Vegas, which is why I want the uncomp avi, but since the music is a simple piano solo I'm being lazy and would like to render it all in one shot to avoid more work.
UJ