I resolved the password problem by installing a patch published by Wanadoo.
I tried to launch the mail protection wizard with the manually setting, checked all the accounts. But no result… 
FrançoisL
While you used the Mail Protection Wizzard, was Outlook express Shut down? and if it was, did you reboot afterwards?
No, OE was not running. But I didn’t reboot. Should I ?
It might help.
REBOOT, it is Windows we are talking about 
Thanks Artras you beat me to it. 
I ran the mail protection wizard again with manual settings, checked all the accounts and rebooted Windows with no success.
I think I found the (very) strange thing :
-I run the mail protection wizard and check all the accounts (4 accounts+1 which is called GGF that I don’t know).
http://perso.wanadoo.fr/licard/forums/mpw_compte_ggf.gif
-I launch OE from the Wanadoo “toolbox” (“espace Wanadoo” in french) with for example the first account.
-I run the MPW again and the account I launched is by default unchecked. ??? ???
I’m glad to see that with the new (great !) release of avast my mails are now scanned 8)