Start Microsoft Outlook and then select Tools | Options | Other tab |
Advanced Options button | Addin manager and deselect AVG.
If you have uninstalled AVG, then you just need to find and delete (or
rename) the file named extend.dat. Since you don't mention what version of
Outlook or your operating system, the best I can tell you it is a hidden
file under your OS user profile. For example, you might find it at:
C:\Documents and Settings\<USERID>\Local Settings\Application
Data\Microsoft\Outlook
C:\Users\<USERID>\AppData\Local\Microsoft\Outlook