hi and welcome tina
you will find that as a result of the upgrade there were changes to the way Avast! handles e-mail accounts.
Providing you are running win2k or later then your e-mail must now be configured as if avast didnt exist.
Previously e-mail was diverted through avast . this is no longer the case. looking around you will see hundreds of threads on this topic mostly around 3-5 weeks ago