NIS 2011 blocking WLM webcam?

Hi...first post here, so I hope you experts can help me.  I have an XP home w/SP2 and running WLM version 2009 build 14.0.8117.416.  I recently had to 'upgrade' to this version of messenger from my previous 8.5 version.  My cam used to work with the 8.5 until I started using NIS 2010 and then upgraded that to 2011.  When I try to establish a video connection I am given the message.."messenger is not available right now try later ..0x8ac70013.  I have 2 identical computers exibiting the same problem.  I read an earlier (closed) post that seemed to fix the issue for a user with NIS2010.  I am a non geek and I really am not sure where to look in 2011 for this 'list' and moving it to the top.   Any ideas what to do for the 2011 version? I am guessing that somewhere along the way 2011 is blocking the connection outbound.

TIA