Windows XP

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20030916

Avast
Version 4.1-268
VPS 0309-1

The latest Avast program update (yesterday) has caused my Mozilla EMail password not to be recognized

when I try to send mail out

and I get a dialog titled

Mail Server Password Required.

which I fill in with the password but it pops up again.

I have reinstalled Avast and Mozilla several times and Mozilla is OK until I install Avast.