What Windows software can change a male voice to a female voice?
Audacity DAW (digital audio workstation) can edit sound files and add many different effects, especially if you install and use plugins. Here is an example of turning a male vocal from a music group sound like a female vocal artist through pitch changing: http://audacity.wonderhowto.com/how-to/turn-male-voice-female-voice-with-audacity-424309/. You can download Audacity from here: http://audacity.sourceforge.net/. In case you wish to export audio to mp3 in Audacity: http://audacity.sourceforge.net/help/faq_i18n?s=install&i=lame-mp3. For extra effects, like auto-tune, through plugins: http://audacity.sourceforge.net/download/plugins.
Audacity is very versatile, cross platform audio editor. There are many tutorials and videos to help make almost any audio effect one wishes, so the possibilities are endless.
Fake Voice, never used it myself?