Help needed with background noise removal

Hello all,

I'm a student, I'm working on a video project. The video was shot in a large room with the aircon on, hence the microphone picked up a lot of background noise. I'm new to audio editing and I've tried adobe audition to remove the noise. I've had a bit of success but the edited audio has a echo, the volume is reduced and there is a strong emphasis on the letter "S".

I am posting a small sample of the audio, I was wondering if you any of you would be able to edit it for me so that I know what settings/filters/processes I can use to achieve the best sound.

Sample Audio: http://rapidshare.com/files/69541725/UL_Consent.wav.html


I would be very grateful for your help.

Thanks.