I did a clean-up on a pc last week, but found later that Messenger Live was no longer working. General Internet access was fine, as was Skype. After a lot of checking - including removing the bloated "Live" suite & reinstalling, it still didn't work. As a last gasp, I removed Nod32 & Live started working immediately. (As part of my clean-up, I had updated the Nod32 from v2.7 to v4.) I then installed Nod32 v3 which still had the problem, so I went back to v2.7 & all is fine again.