Analog audio-in does not appear as a selection in Windows XP or Vista on MacBook Pro (Mid 2009) and later

The analog audio-in port on the following portable computers does not appear as an audio-in source in Boot Camp with Windows XP or Vista: MacBook Pro (17-inch, Mid 2010) MacBook Pro (15-inch, Mid 2010) MacBook Pro (13-inch, Mid 2010) MacBook Pro (15-inch, 2.53GHz, Mid 2009) MacBook Pro (15-inch, Mid 2009) MacBook Pro (13-inch, Mid 2009)