I decided to open this thread waiting for a solution (specially for number 3)...
1) I noticed that the aswBoot.exe was moved from avast folder to windows\system32 due to access rights. I my updated system the file was not deleted from the avast folder. In a fresh installation, it appears only in windows\system32 folder.
2) The update procedure does not delete a lot of Data\Log\*unp files.
3) Remains a problem while sending smtp authenticated emails :'(
