Audio editing of screencast video's

I have a bunch of videos with poor sound quality. I need you to improve the sound as good as possible (remove background noise, make the voice clearer (bass/treble/...), optimize sound volume). You do not need to listen to the whole video and edit individual sounds, you may edit each whole file in one piece. You should not edit the video and you should send me only the sound file so that we can use this in the final video editing process. The videos are not in English but that shouldn't matter. You have no need to understand what the person is saying. I want a short example of what you can do with the attached file attached. If the result is good, you may do all the files. This is an urgent project.