avast home - vista business final - proxy client

[divemaster]

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

 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

[divemaster]

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.