Sometimes Outlook Express 6.0 asks three times the password (however it shows it as already inserted with stars (********) ) so i have to push three times enter.
It means that avast was unable to connect to the mail server. When you push OK, avast tries to connect again. Yes, maybe it's a little bit confusing.
Also there seems to be a problem running avast mail protection wizard and outlook express. It seems that the mail protection wizard changes something in outlook making it unsuable by isp email address though a hotmail account for receiving will still work.
Mail protection wizard changes SMTP and POP3 server addresses in your account to 127.0.0.1 as is noted on its first page. Avast is not able to scan mail for viruses without this change. Hotmail account is not changed because it doesn't use SMTP/PO3 and therefore it is not protected by avast.