To disable this pesky notifier, simply follow these directions:
For XP and Vista Users:
1. Start-> Control Panel
2. Administrative tools-> Local security policy
3. Click on Software Restriction Policy-> Action (at the top)-> create new restriction policies
4. Right-click additional rules (on the right side)-> new path rule
5. Click Browse and navigate to C:\Program Files\(Avira)\AntiVir Desktop\ and double-click avnotify.exe
6. Set the security level to Disallowed-> apply-> ok