First of all, try this:
If this doesn't help, let me know and i'll try to find another solution for you.
- Log in to Windows Live Messenger.
- Click Show Menu in the right hand corner and then click Show the menu bar.
- Click Tools on the menu bar and then click Audio and video setup.
- Click Next and then select your webcam from the drop down list.
- Click Finish.
If this doesn't help, let me know and i'll try to find another solution for you.