strange things since inst avast 4

[lookbehind]

I've recently installed Avast 4 free. It may be coincidental but twice my email setting have been corrupted. I have several accounts with my BB provider in form somename@ username. ispname.com.
  Pop3 server xxx. ispname.net
SMTP server yyy.ispname.net .

The latest change that occured altered both server details to
zzz.0.0.1 and my user name to username#ispname.net.

I have completed an indeptht scan after reinstating the proper settings and used two diffrent virus checkers, your and another providers ( that is usually not installed) but no viruses have been found. I not that with your scan a number of files are unscannable but these appear to be ini and other windows ' housekeeping' items- nothing to cause alarm. Any views if there may be something causing the problem which Avast can cure?

[Eddy]

This is not strange at all. That change is made by Avast in order to be able to scan the mail.

I suggest you upgrade to Avast 4.5. That version handles the mail in a different way.
Upgrade instructions (See the first post by Vlk there)

[lookbehind]

Strange what you say, as since resetting all seems to work OK. from your reply am I intended to conclude that my mail is not now beingf scanned as resident protection is shown as normal in the On Access Protection Control box?

[Eddy]

Just upgrade to 4.5 beta and see if everything is working. 4.5 final will be released next saterday anyway. So spending time on trubleshooting 4.1 is a waste of time imho.