Mise à jour Antivir impossible

Bonjour,

Depuis quelques jours je n'arrive plus à mette à jour Antivir.
Voici le rapport de mon dernier essai.

14.06.2008 22:16:46 - Installation Directory: C:\Program Files\Avira\AntiVir PersonalEdition Classic\
14.06.2008 22:16:46 - Backup Directory: C:\Documents and Settings\All Users\Application Data\Avira\AntiVir PersonalEdition Classic\BACKUP\
14.06.2008 22:16:46 - Temp Directory: C:\Documents and Settings\All Users\Application Data\Avira\AntiVir PersonalEdition Classic\Update\AVUPDATE_4854272e\
14.06.2008 22:16:46 - Using System's global Proxy settings
14.06.2008 22:16:46 - Start the Update GUI... Displaymode: 0
14.06.2008 22:16:46 - selftest successful: C:\Program Files\Avira\AntiVir PersonalEdition Classic\updlib.dll
14.06.2008 22:16:47 - selftest successful: C:\Program Files\Avira\AntiVir PersonalEdition Classic\updlibrc.dll
14.06.2008 22:16:46 - Installation Directory: C:\Program Files\Avira\AntiVir PersonalEdition Classic\
14.06.2008 22:16:46 - Backup Directory: C:\Documents and Settings\All Users\Application Data\Avira\AntiVir PersonalEdition Classic\BACKUP\
14.06.2008 22:16:46 - Temp Directory: C:\Documents and Settings\All Users\Application Data\Avira\AntiVir PersonalEdition Classic\Update\AVUPDATE_4854272e\
14.06.2008 22:16:46 - Using System's global Proxy settings
14.06.2008 22:16:46 - Start the Update GUI... Displaymode: 0
14.06.2008 22:16:46 - selftest successful: C:\Program Files\Avira\AntiVir PersonalEdition Classic\updlib.dll
14.06.2008 22:16:47 - selftest successful: C:\Program Files\Avira\AntiVir PersonalEdition Classic\updlibrc.dll
14.06.2008 22:16:47 - Avira AntiVir Personal – Free Antivirus
14.06.2008 22:17:09 - Invalid system proxy
14.06.2008 22:17:09 - Switching to next update server
14.06.2008 22:17:30 - Invalid system proxy
14.06.2008 22:17:30 - Switching to next update server
14.06.2008 22:17:52 - Invalid system proxy
14.06.2008 22:17:52 - Switching to next update server
14.06.2008 22:18:13 - Invalid system proxy
14.06.2008 22:18:13 - Switching to next update server
14.06.2008 22:18:35 - Invalid system proxy
14.06.2008 22:18:35 - Switching to next update server
14.06.2008 22:18:56 - Invalid system proxy
14.06.2008 22:18:56 - Switching to next update server
14.06.2008 22:19:00 - Copy file C:\Documents and Settings\All Users\Application Data\Avira\AntiVir PersonalEdition Classic\Update\AVUPDATE_4854272e\idx/master.idx to C:\Documents and Settings\All Users\Application Data\Avira\AntiVir PersonalEdition Classic\IDX\master.idx
14.06.2008 22:19:00 - Master IDX file has changed
14.06.2008 22:19:08 - Keyfile: OK [FULL Mode]
14.06.2008 22:19:08 - Downloading the product.info file from http://dl3.avgate.net/upd/idx/vdf.info.gz
14.06.2008 22:19:30 - There was a problem updating from the specified server: Invalid system proxy
14.06.2008 22:19:30 - Switching to next update server
14.06.2008 22:19:51 - There was a problem updating from the specified server: Invalid system proxy
14.06.2008 22:19:51 - Switching to next update server
14.06.2008 22:20:13 - There was a problem updating from the specified server: Invalid system proxy
14.06.2008 22:20:13 - Switching to next update server
14.06.2008 22:20:34 - There was a problem updating from the specified server: Invalid system proxy
14.06.2008 22:20:34 - Switching to next update server
14.06.2008 22:21:14 - There was a problem updating from the specified server: Invalid system proxy
14.06.2008 22:21:14 - Switching to next update server
14.06.2008 22:21:36 - There was a problem updating from the specified server: Invalid system proxy
14.06.2008 22:21:36 - Switching to next update server
14.06.2008 22:21:57 - There was a problem updating from the specified server: Invalid system proxy
14.06.2008 22:21:57 - Switching to next update server
14.06.2008 22:22:26 - Registry entry created successfully: Software\Avira\AntiVir PersonalEdition Classic |UpdateInProgress
14.06.2008 22:22:26 - Critical error: Update process was cancelled.

Merci d'avance