268029 Remove Buzz From Video Files

I am in need of an audio/video expert that can help me remove the background buzz/hum from videos that I recorded with my USB headset. I recorded the videos using Camtasia. I don't want to have to rerecord the videos so I am looking for someone that can remove the buzz that you hear in the background. I know this is possible because I read about a software that does it, I just don't know how to do it. Below is the download link for a video that you can review in AVI format so you can further figure out the problem. The first person to submit this file back to me cleaned up and without the background noise will be give priority placement in the selection process. This is so important so I need to ensure the person I hire for this project can actually do the work. Here is the download link. The video is found in a zip file for easier downloading convenience. [login to view URL] I have a total of 25 videos to edit. The videos average 10 to 12 minutes each. Preference is given to someone that can complete this work within 2 days of starting. I will be happy to give a bonus. My budget is $150 to $200, and I will give a $50 for the person that can get this done in 2 days. This is important to me. Thank you for bidding and let me know if further information is needed for your bid.