I just completed the Webcast for the Wisconsin Regional. You are under the gun to get this ready but the following instructions should guide you.
http://robotics.arc.nasa.gov/events/webcasting.php
NASA will provide the webcasting if you provide the uplink. Windows Media Encoder works great and is simple to use. I used the recommended AVERMEDIA device and it worked great. ($50 from Tigerdirect). I would be happy to send the device to you for use this weekend if you need it. You can probably use the device that you have with Windows Media Encoder. You may want to download it and try it.
NASA was GREAT to work with. Knowledgeable and helpful. Feel free to write back if you want more help.
Dave G / Wisconsin Regional Planning Committee