Audio or Webcam Freezes (MSN) Messenger

Weather I use MSN Messenger 6.2 or Windows Messenger 5.1. I can type to
people absolutely fine, no problems, hours & hours. The second someone tryes
audio/video with me, or if I try audio/video with them, Messenger locks up
and eventually crashes after about 10min. The same issue happens when I try
the Audio/Video config.
- I've unplugged my webcam to eliminate it being the problem, nogo.
- I've upgraded my SBLive! 5.1 drivers to the latest version. Nope
- I've reinstalled MSN Messenger 6.2, and tryed 7 Beta
- I've updated Windows Messenger (since you can't reinstall it).
- I've updated every driver on my system.

| WinXP Pro SP2 w. all updates
| P4 3.0Ghz, 1024Mb 400Mhz PC3200 DDR, 200Gb SATA
| uPnP Linksys BEFW11S4 Router (Happens even when I plug directly into the
internet)
| Tons of patience and computer knowledge (neither are working right now)