sound improvement

You may be able to filter quite a lot of the noise out by fiddling with the graphic equalizer. If you increase the 1KHZ band (normally the middle one) and reduce the others you may be able to hear the voices easier.

Off the bat, I'd recommend simple EQ filtering. You can play back the WAV in winamp and change the EQ settings until it sounds good* and then take a program and record the output from the Windows Mixe

For what values of 'clean up'? Are you looking to remove mic noise in general? If so, there are various methods that can analyse a section of audio that contains *only* unwanted noise, and remove it from the rest. Audition and the free Audacity have something like this built-in; there's also a separate plugin for SoundForge and the stand-alone DART (which is quite effective but has a god-awful interface).

I've used HYPERLINK "http://audacity.sourceforge.net/" audacity, which BobInce mentioned. It's free (as beer and speech) and multi-platform. The noise reduction filter is built in and pretty easy to use (you "train" it on silent parts of the recording, then apply the filter to the recording as a whole). It takes a little trial-and-error to find the parameters that work best (most noise reduction, fewest artifacts). It has worked well for me to remove computer fan whirr from home recordings but I'm no audiophile so my standards are easily met.r option in the windows mixing panel.