My sister and I are both on Win XP pro, Linsys Router
BEFSR41, Intel NIC card (both of ours were enabled) we
disabled them. After figuring out that she did not have
the most current update for the linksys, she installed
that and now we work PERFECTLY. We tried disabling the
QoS Packet, and that seemed to make no difference either
way.
I also work great with my son overseas who is on XP home,
but he is not on a router, and no firewall.
My other son on dial up doesn't seem to be working yet. I
get his video but not audio yet, he gets my video and
audio. Still working on that one.