Well.

Try deleting the following values

PopListen=127.0.0.1:110
SmtpListen=127.0.0.1:25
ImapListen=127.0.0.1:143

from the file \data\avast4.ini.

I’m wondering - haven’t you ever gotten a warning that some of the ports (25, 110, 143) is already occupied? (Either with avast 4.1 or 4.5)

Cheers
Vlk