AntiVirus '08 Interfering with IMVU

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I just downloaded the '08 version of Norton AntiVirus and it is interfering with my IMVU, a 3d chat server for those of you who don't know what it is. Anytime someone invites me into a chat room, the invite gets blocked. I don't know what to do to stop this as even if I turn my protectin completely off, Norton still blocks it as an "attack" on my computer. Help!!!

 

IMVU 3D Chat

What firewall are you running?