Hauppage PVR-150 MCE in Windows Live Messenger

I have managed to set up my TV Tuner so it works with my PC - looks great whichever channel I use. However in Windows Live Messenger I have a slight picture problem. I am trying to configure MSN to use my TV Tuner as a webcam so that my friends can see and hear a particular TV Channel or one from my Cable Set top box

When configuring the TV Tuner using the webcam settings the whole picture appears and it can be seen, but when the TV Tuner is being shown in the preview inside the conversation window e.g. whenever I offer my webcam to be viewed by the recipient, the picture is "cropped" only showing the very center of the screen and cutting off other items like the onscreen mini guide for my PVR. In all the other programs including the Media Center program the picture is full and I can see everything. Also the sound from the TV Tuner does not work - the only way I get around this is to send an audio feed into the line in port of my sound card from the PVRs Phono output and teach MSN to "listen" to this device rather than the microphone, but this is out of sync with the TV Tuner as the TV Tuner is 3 seconds beind relying on Time Shift Technology!! 8O Also when viewing analogue TV channels the audio feed is useless!!

How can I fix this so that I can use the TV Tuner with sound in Windows Live Messenger and that my friends see a full picture instead of a cropped picture?