I recently put my Dell 8300 2.6 GHZ on line, Windows XP  and cannot transmit my audio when in contact using either MSN Messenger or Windows Messenger. Everything checks out that the program is working and you can see the audio bar moving when talking but your contact does not hear you. Everything has been checked to make sure the mike is not muted. Also using the audio tuning wizard in either program indicates everything is working. I am not operating behind a firewall. My computer has the SoundBlaster Live 5.1 installed.I also have the latest version of the programs installed. I have tried voice communication with two different parties and neither can hear my audio. I previously used MSN Messenger on my older computer which had Windows 98 and no problems there. I was also using the same cable modem. Any help is most appreciated.