I've been having problem with Microsoft Outlook 2007. As i have recently been recieving this message:

I have got ESET Nod Internet Security installed like 2 months ago but then uninstalled it in about a month later since the Trial key was expired. I have then installed AVG internet security "free version" and right after installed till about 3 days ago, was totally fine, nothing wrong with it at all. Until 3 days ago, i noticed i could not send mails out from my Outlook and it somehow could receive some emails but not the other some. Everytime i open my Outlook, this message pops up and i have no idea what to do with this.
I have had a look in Program Files > then try to find Eset Nod Internet security but could not find it. I have also tried to find Add-Ins in Microsoft Outlook but could not find it either.