I used to have the same error the first time i used Avast!
I forgot to close Outlook Express

THIS IS VERY IMPORTANT: you should close outlook express
before running the mail wizard, otherwise you get those errors.
the wizards sets your smtp en pop3 servers to 127.0.0.1 (local host,...if i am not mistaken)
The safest thing to do is remove the the mailsecurity with the wizard. Make sure outlook express is closed and then restart the wizard.
If it then fails again,...re-enter your pop3 account (delete the previous one) and restart the wizard with outlook closed.
In my opinion it should work perfectly,...had no complaints afterwards.