For Lame, I dug around the soundforge site until I found the inf file for Lame, then you can right-click and 'install' it to windows. There is also a windows executable version, but this doesn't install it to the system, just to audacity from what I can tell. I have no idea why it's so hard to find a Windows installer for Lame.

Audacity is free and some here have just gotten used to going that route for the mp3 conversion.
Mix the wav in RB, then convert to mp3 in Audacity.


Make your sound your own!
.. I do not work here, but the benefits are still awesome