avast home - vista business final - proxy client

hi friends.

i am working on a vista busniess final version and use avast home version (all update !)
but i be behind a ms-isa server 2003 :frowning:

have no problem to come out to the internet and the proxy settings are correct in the IE7.x.

also the download of the avast software and the update on the installation it had works well. but after a restart of the system, as avast had need it, i cant make a update.

if i want to change the setting in the connection setup, i get a message from the vista that he cant show it on the “desktop” and the he must open it under a other screen.

there i can set the proxy settings, but dont get a connection for automatic download and so on…

error message in the log file is:

13.02.2007 09:16:22.000 1171354582 package Transferred files: 0
13.02.2007 09:16:22.000 1171354582 package Transferred bytes: 0
13.02.2007 09:16:22.000 1171354582 package Transfer time: 0 ms
13.02.2007 09:16:22.000 1171354582 file NeedReboot=false
13.02.2007 09:16:22.000 1171354582 general Return code: 0x20000006 [Other HTTP error (403), while trying 75.126.120.196:80//iavs4x/servers.def]
13.02.2007 09:16:22.000 1171354582 general Stopped: 13.02.2007, 09:16:22

ANY IDEAS ??

kind regards

nobody can help me in this case ?
i think its compatibility problem of the avast update server.
i be logged in as REAL administrator and not “power user”.
(hidden admin account activate and logged in)

i use avast since some years and offer it for my customers, but i hope that the support may help me to find a solution…

k.r.