Eddy
38
Could it be possible that the virus killer has left something behind during the uninstall.
Yes, NAV leaves things behind. Use the uninstall util to completly remove it as is told in many threads here. Uninstall Avast, reboot. Than install Avast, setup the mail as if Avast isn't there and run the mail protection wizzard.
http://service1.symantec.com/SUPPORT/nav.nsf/docid/2001092114452606