Also, this is a Windows 7 PC.
On my other PC (Windows XP), I see there's an Avast 5 listed in the plugin section and the plugin works.
On this PC, I see an Avast 4 plugin (which was disabled the first time I opened outlook and it was invalid), but no listing of an Avast 5 plugin.
As I said, I already uninstalled and reinstalled Avast 5.
How do I get the Outlook plugin to install properly?