Timmotron, avast will conflict with AVG 6 free at certain XP Home systems. In fact, I think on most of them… :-\

You can use the email checker from AVG 7.0 free and avast without problem but only one resident should be installed in the system.

You can use [URL=http://files.avast.com/files/eng/avclear4.exe]avast uninstall utility[/b] to remove it. I’m not sure AVG has such a tool.
Maybe you will need to clean your Windows registry :-\ :cry: