You can follow this Microsoft article to disable AVG add-in.
What is the situation when you disable AVG E-mail scanner in AVG User Interface? Open AVG -> double-click on E-mail Scanner component and clear all ticks.
What is the current situation?
after upgrading to AVG2011 I had trouble sending messages with attachments. After a quick and panicked search for "Outook won't send," the answer was AVG2011 is the cause and to disable avgoutlook.addin. I can't even FIND that addin/file/???. So HOW do I quickly disable AVG from running when I absolutely MUST send email NOW instead of tomorrow!!!! and where is that addin?