help w/ voice/vid conversation

Please help me anybody. this is the thing. i recently got a webcam, and would like to do vido/voice conversations, but the thing is, everythime and every person i try this with, msn always ends up telling me that the conversation has ended, but the thing is, neither me or my friends cancel/end request. 🙁 now, i have checked everywhere and looked around for suppor and it semes to be a blocking problem, but i have neither a firewall, router, xp firewall is disable.. im just plain running straight to the net. .. now, the weird thing is also that. sometimes.. only sometimes, when the other user sends ME the invitation and i accept, i can do this just fine. now this is in both audio, and video or separate conversations.. i have made i got the same version they have, (4.6 not win but MSN.)…etc etc. please show me to the light 🙂 it’d be greately apreciated. i will check here often but if you rather email me, here is my emai labch_001@yahoo.com