Below is a link to the forum for Vsee the PC based video conferencing system and a solution I worked on to get the video working inside of Parallels running Windows XP.
The issue was the audio would work but the video would stick in initializing and only ever display a black screen. The solution was to reduce the colors in XP down to 24 bit color.
http://vsee.com/forum/viewtopic.php?f=4&t=168&p=632&hilit=mac#p632
