strange AVG behavior

Hello everyone

First basic info:

I run WIN XP SP2
I also use Zone Alarm Pro
and i run ad-aware and ewido free trial from time to time
As is clear from the subject line i run AVG (ver 7.5) as my anti virus client
I use outlook 2003 as an email client

Now the background:

It all happened after deleting 4 items from my AVG virus vault.

And the problem is...

My avg virus vault claims to be empty, but my outlook virus vault mail folder shows one massage and another hidden contaminated massage in it. I scanned my computer fully with avg and it is still so.

Any ideas?