code46,
Um, very strange. Do you use any other type of antivirus software on the computer? Any filters? Does your ISP use any type of antispam tool?
Just looking for other possibilities before I say to reinstall.
That may be the easiest thing to do at this point.
Use Control Panel/Add-Remove.
Reboot,
then reinstall Avast.
If you choose to reinstall, then run a PROGRAM update.
This updates both program and vps database at the same time.
Ill be here,
Techie